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Finding the Fourth Proportional to 123.96, 170.73 and 99.12

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Solution

The fourth proportional to 123.96, 170.73 and 99.12 is: 136.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.96 : 170.73 = 99.12 : x
  2. Step 2: Convert to fraction form
    123.96/170.73 = 99.12/x
  3. Step 3: Cross multiply
    123.96x = 170.73 × 99.12
  4. Step 4: Simplify right side
    123.96x = 16,922.76
  5. Step 5: Solve for x
    x = 16,922.76/123.96
  6. Step 6: Final answer
    x = 136.52

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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.