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Finding the Fourth Proportional to 71,691.76, 98,934.08 and 39,860.38

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Solution

The fourth proportional to 71,691.76, 98,934.08 and 39,860.38 is: 55,007.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,691.76 : 98,934.08 = 39,860.38 : x
  2. Step 2: Convert to fraction form
    71,691.76/98,934.08 = 39,860.38/x
  3. Step 3: Cross multiply
    71,691.76x = 98,934.08 × 39,860.38
  4. Step 4: Simplify right side
    71,691.76x = 3,943,550,023.75
  5. Step 5: Solve for x
    x = 3,943,550,023.75/71,691.76
  6. Step 6: Final answer
    x = 55,007.02

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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.