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Finding the Fourth Proportional to 123,874.20, 171,017.33 and 81,555.75

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Solution

The fourth proportional to 123,874.20, 171,017.33 and 81,555.75 is: 112,593.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,874.20 : 171,017.33 = 81,555.75 : x
  2. Step 2: Convert to fraction form
    123,874.20/171,017.33 = 81,555.75/x
  3. Step 3: Cross multiply
    123,874.20x = 171,017.33 × 81,555.75
  4. Step 4: Simplify right side
    123,874.20x = 13,947,446,611.15
  5. Step 5: Solve for x
    x = 13,947,446,611.15/123,874.20
  6. Step 6: Final answer
    x = 112,593.64

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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.