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Finding the Fourth Proportional to 123,159.15, 169,961.49 and 72,159.66

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Solution

The fourth proportional to 123,159.15, 169,961.49 and 72,159.66 is: 99,581.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,159.15 : 169,961.49 = 72,159.66 : x
  2. Step 2: Convert to fraction form
    123,159.15/169,961.49 = 72,159.66/x
  3. Step 3: Cross multiply
    123,159.15x = 169,961.49 × 72,159.66
  4. Step 4: Simplify right side
    123,159.15x = 12,264,363,331.49
  5. Step 5: Solve for x
    x = 12,264,363,331.49/123,159.15
  6. Step 6: Final answer
    x = 99,581.42

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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.