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Finding the Fourth Proportional to 71,691.90, 98,935.47 and 39,859.98

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Solution

The fourth proportional to 71,691.90, 98,935.47 and 39,859.98 is: 55,007.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,691.90 : 98,935.47 = 39,859.98 : x
  2. Step 2: Convert to fraction form
    71,691.90/98,935.47 = 39,859.98/x
  3. Step 3: Cross multiply
    71,691.90x = 98,935.47 × 39,859.98
  4. Step 4: Simplify right side
    71,691.90x = 3,943,565,855.49
  5. Step 5: Solve for x
    x = 3,943,565,855.49/71,691.90
  6. Step 6: Final answer
    x = 55,007.13

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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.