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Finding the Fourth Proportional to 123.44, 185.15 and 77.81

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Solution

The fourth proportional to 123.44, 185.15 and 77.81 is: 116.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.44 : 185.15 = 77.81 : x
  2. Step 2: Convert to fraction form
    123.44/185.15 = 77.81/x
  3. Step 3: Cross multiply
    123.44x = 185.15 × 77.81
  4. Step 4: Simplify right side
    123.44x = 14,405.79
  5. Step 5: Solve for x
    x = 14,405.79/123.44
  6. Step 6: Final answer
    x = 116.71

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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.