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Finding the Fourth Proportional to 123.91, 185.55 and 98.11

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Solution

The fourth proportional to 123.91, 185.55 and 98.11 is: 146.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.91 : 185.55 = 98.11 : x
  2. Step 2: Convert to fraction form
    123.91/185.55 = 98.11/x
  3. Step 3: Cross multiply
    123.91x = 185.55 × 98.11
  4. Step 4: Simplify right side
    123.91x = 18,204.31
  5. Step 5: Solve for x
    x = 18,204.31/123.91
  6. Step 6: Final answer
    x = 146.92

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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.