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Finding the Fourth Proportional to 123.80, 185.38 and 77.99

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Solution

The fourth proportional to 123.80, 185.38 and 77.99 is: 116.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.80 : 185.38 = 77.99 : x
  2. Step 2: Convert to fraction form
    123.80/185.38 = 77.99/x
  3. Step 3: Cross multiply
    123.80x = 185.38 × 77.99
  4. Step 4: Simplify right side
    123.80x = 14,456.66
  5. Step 5: Solve for x
    x = 14,456.66/123.80
  6. Step 6: Final answer
    x = 116.78

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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.