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Finding the Fourth Proportional to 123,087.78, 169,861.13 and 66,499.16

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Solution

The fourth proportional to 123,087.78, 169,861.13 and 66,499.16 is: 91,768.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,087.78 : 169,861.13 = 66,499.16 : x
  2. Step 2: Convert to fraction form
    123,087.78/169,861.13 = 66,499.16/x
  3. Step 3: Cross multiply
    123,087.78x = 169,861.13 × 66,499.16
  4. Step 4: Simplify right side
    123,087.78x = 11,295,621,279.85
  5. Step 5: Solve for x
    x = 11,295,621,279.85/123,087.78
  6. Step 6: Final answer
    x = 91,768.83

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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.