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Finding the Fourth Proportional to 6,420.77, 8,861.30 and 3,768.12

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Solution

The fourth proportional to 6,420.77, 8,861.30 and 3,768.12 is: 5,200.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,420.77 : 8,861.30 = 3,768.12 : x
  2. Step 2: Convert to fraction form
    6,420.77/8,861.30 = 3,768.12/x
  3. Step 3: Cross multiply
    6,420.77x = 8,861.30 × 3,768.12
  4. Step 4: Simplify right side
    6,420.77x = 33,390,437.05
  5. Step 5: Solve for x
    x = 33,390,437.05/6,420.77
  6. Step 6: Final answer
    x = 5,200.38

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Find fourth proportional to 3,210.38, 4,430.65 and 1,884.06
Half scale
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Double scale
Find fourth proportional to 6,421.77, 8,862.68 and 3,769.12
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.