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Finding the Fourth Proportional to 123,989.93, 185,805.40 and 85,481.91

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Solution

The fourth proportional to 123,989.93, 185,805.40 and 85,481.91 is: 128,099.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,989.93 : 185,805.40 = 85,481.91 : x
  2. Step 2: Convert to fraction form
    123,989.93/185,805.40 = 85,481.91/x
  3. Step 3: Cross multiply
    123,989.93x = 185,805.40 × 85,481.91
  4. Step 4: Simplify right side
    123,989.93x = 15,883,000,480.31
  5. Step 5: Solve for x
    x = 15,883,000,480.31/123,989.93
  6. Step 6: Final answer
    x = 128,099.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.