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Finding the Fourth Proportional to 138,545.75, 191,193.91 and 87,580.88

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Solution

The fourth proportional to 138,545.75, 191,193.91 and 87,580.88 is: 120,862.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,545.75 : 191,193.91 = 87,580.88 : x
  2. Step 2: Convert to fraction form
    138,545.75/191,193.91 = 87,580.88/x
  3. Step 3: Cross multiply
    138,545.75x = 191,193.91 × 87,580.88
  4. Step 4: Simplify right side
    138,545.75x = 16,744,931,147.47
  5. Step 5: Solve for x
    x = 16,744,931,147.47/138,545.75
  6. Step 6: Final answer
    x = 120,862.11

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1.5x scale

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.