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Finding the Fourth Proportional to 71,743.32, 99,007.11 and 39,915.18

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Solution

The fourth proportional to 71,743.32, 99,007.11 and 39,915.18 is: 55,083.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,743.32 : 99,007.11 = 39,915.18 : x
  2. Step 2: Convert to fraction form
    71,743.32/99,007.11 = 39,915.18/x
  3. Step 3: Cross multiply
    71,743.32x = 99,007.11 × 39,915.18
  4. Step 4: Simplify right side
    71,743.32x = 3,951,886,616.93
  5. Step 5: Solve for x
    x = 3,951,886,616.93/71,743.32
  6. Step 6: Final answer
    x = 55,083.69

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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.