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Finding the Fourth Proportional to 123,876.20, 171,020.10 and 81,557.76

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Solution

The fourth proportional to 123,876.20, 171,020.10 and 81,557.76 is: 112,596.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,876.20 : 171,020.10 = 81,557.76 : x
  2. Step 2: Convert to fraction form
    123,876.20/171,020.10 = 81,557.76/x
  3. Step 3: Cross multiply
    123,876.20x = 171,020.10 × 81,557.76
  4. Step 4: Simplify right side
    123,876.20x = 13,948,016,270.98
  5. Step 5: Solve for x
    x = 13,948,016,270.98/123,876.20
  6. Step 6: Final answer
    x = 112,596.42

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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.