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Finding the Fourth Proportional to 123.97, 171.07 and 99.10

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Solution

The fourth proportional to 123.97, 171.07 and 99.10 is: 136.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.97 : 171.07 = 99.10 : x
  2. Step 2: Convert to fraction form
    123.97/171.07 = 99.10/x
  3. Step 3: Cross multiply
    123.97x = 171.07 × 99.10
  4. Step 4: Simplify right side
    123.97x = 16,953.04
  5. Step 5: Solve for x
    x = 16,953.04/123.97
  6. Step 6: Final answer
    x = 136.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.