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Finding the Fourth Proportional to 8,019.72, 11,069.22 and 6,420.12

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Solution

The fourth proportional to 8,019.72, 11,069.22 and 6,420.12 is: 8,861.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,019.72 : 11,069.22 = 6,420.12 : x
  2. Step 2: Convert to fraction form
    8,019.72/11,069.22 = 6,420.12/x
  3. Step 3: Cross multiply
    8,019.72x = 11,069.22 × 6,420.12
  4. Step 4: Simplify right side
    8,019.72x = 71,065,720.71
  5. Step 5: Solve for x
    x = 71,065,720.71/8,019.72
  6. Step 6: Final answer
    x = 8,861.37

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Half scale
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Double scale
Find fourth proportional to 8,020.72, 11,070.60 and 6,421.12
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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.