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Finding the Fourth Proportional to 123,906.40, 185,859.60 and 86,581.60

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Solution

The fourth proportional to 123,906.40, 185,859.60 and 86,581.60 is: 129,872.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,906.40 : 185,859.60 = 86,581.60 : x
  2. Step 2: Convert to fraction form
    123,906.40/185,859.60 = 86,581.60/x
  3. Step 3: Cross multiply
    123,906.40x = 185,859.60 × 86,581.60
  4. Step 4: Simplify right side
    123,906.40x = 16,092,021,543.36
  5. Step 5: Solve for x
    x = 16,092,021,543.36/123,906.40
  6. Step 6: Final answer
    x = 129,872.40

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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.