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Finding the Fourth Proportional to 86,613.60, 129,920.40 and 77,428.20

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Solution

The fourth proportional to 86,613.60, 129,920.40 and 77,428.20 is: 116,142.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,613.60 : 129,920.40 = 77,428.20 : x
  2. Step 2: Convert to fraction form
    86,613.60/129,920.40 = 77,428.20/x
  3. Step 3: Cross multiply
    86,613.60x = 129,920.40 × 77,428.20
  4. Step 4: Simplify right side
    86,613.60x = 10,059,502,715.28
  5. Step 5: Solve for x
    x = 10,059,502,715.28/86,613.60
  6. Step 6: Final answer
    x = 116,142.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.