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Finding the Fourth Proportional to 78,691.56, 108,592.92 and 42,881.88

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Solution

The fourth proportional to 78,691.56, 108,592.92 and 42,881.88 is: 59,176.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,691.56 : 108,592.92 = 42,881.88 : x
  2. Step 2: Convert to fraction form
    78,691.56/108,592.92 = 42,881.88/x
  3. Step 3: Cross multiply
    78,691.56x = 108,592.92 × 42,881.88
  4. Step 4: Simplify right side
    78,691.56x = 4,656,668,564.29
  5. Step 5: Solve for x
    x = 4,656,668,564.29/78,691.56
  6. Step 6: Final answer
    x = 59,176.21

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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.