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Finding the Fourth Proportional to 71,387.30, 98,515.16 and 39,556.88

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Solution

The fourth proportional to 71,387.30, 98,515.16 and 39,556.88 is: 54,588.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,387.30 : 98,515.16 = 39,556.88 : x
  2. Step 2: Convert to fraction form
    71,387.30/98,515.16 = 39,556.88/x
  3. Step 3: Cross multiply
    71,387.30x = 98,515.16 × 39,556.88
  4. Step 4: Simplify right side
    71,387.30x = 3,896,951,671.94
  5. Step 5: Solve for x
    x = 3,896,951,671.94/71,387.30
  6. Step 6: Final answer
    x = 54,588.87

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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.