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Finding the Fourth Proportional to 129,335.52, 178,481.73 and 71,973.86

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Solution

The fourth proportional to 129,335.52, 178,481.73 and 71,973.86 is: 99,323.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,335.52 : 178,481.73 = 71,973.86 : x
  2. Step 2: Convert to fraction form
    129,335.52/178,481.73 = 71,973.86/x
  3. Step 3: Cross multiply
    129,335.52x = 178,481.73 × 71,973.86
  4. Step 4: Simplify right side
    129,335.52x = 12,846,018,687.71
  5. Step 5: Solve for x
    x = 12,846,018,687.71/129,335.52
  6. Step 6: Final answer
    x = 99,323.21

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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.