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Finding the Fourth Proportional to 172,445.92, 258,581.40 and 78,871.52

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Solution

The fourth proportional to 172,445.92, 258,581.40 and 78,871.52 is: 118,267.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,445.92 : 258,581.40 = 78,871.52 : x
  2. Step 2: Convert to fraction form
    172,445.92/258,581.40 = 78,871.52/x
  3. Step 3: Cross multiply
    172,445.92x = 258,581.40 × 78,871.52
  4. Step 4: Simplify right side
    172,445.92x = 20,394,708,061.73
  5. Step 5: Solve for x
    x = 20,394,708,061.73/172,445.92
  6. Step 6: Final answer
    x = 118,267.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.