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Finding the Fourth Proportional to 71,390.96, 98,520 and 39,561.92

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Solution

The fourth proportional to 71,390.96, 98,520 and 39,561.92 is: 54,595.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,390.96 : 98,520 = 39,561.92 : x
  2. Step 2: Convert to fraction form
    71,390.96/98,520 = 39,561.92/x
  3. Step 3: Cross multiply
    71,390.96x = 98,520 × 39,561.92
  4. Step 4: Simplify right side
    71,390.96x = 3,897,640,358.40
  5. Step 5: Solve for x
    x = 3,897,640,358.40/71,390.96
  6. Step 6: Final answer
    x = 54,595.71

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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.