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Finding the Fourth Proportional to 71,672.72, 98,905.80 and 39,842.96

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Solution

The fourth proportional to 71,672.72, 98,905.80 and 39,842.96 is: 54,981.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,672.72 : 98,905.80 = 39,842.96 : x
  2. Step 2: Convert to fraction form
    71,672.72/98,905.80 = 39,842.96/x
  3. Step 3: Cross multiply
    71,672.72x = 98,905.80 × 39,842.96
  4. Step 4: Simplify right side
    71,672.72x = 3,940,699,833.17
  5. Step 5: Solve for x
    x = 3,940,699,833.17/71,672.72
  6. Step 6: Final answer
    x = 54,981.87

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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.