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Finding the Fourth Proportional to 6,420.42, 8,860.88 and 3,768.21

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Solution

The fourth proportional to 6,420.42, 8,860.88 and 3,768.21 is: 5,200.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,420.42 : 8,860.88 = 3,768.21 : x
  2. Step 2: Convert to fraction form
    6,420.42/8,860.88 = 3,768.21/x
  3. Step 3: Cross multiply
    6,420.42x = 8,860.88 × 3,768.21
  4. Step 4: Simplify right side
    6,420.42x = 33,389,637.78
  5. Step 5: Solve for x
    x = 33,389,637.78/6,420.42
  6. Step 6: Final answer
    x = 5,200.54

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Double scale
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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.