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Finding the Fourth Proportional to 124.12, 171.32 and 72.38

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Solution

The fourth proportional to 124.12, 171.32 and 72.38 is: 99.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.12 : 171.32 = 72.38 : x
  2. Step 2: Convert to fraction form
    124.12/171.32 = 72.38/x
  3. Step 3: Cross multiply
    124.12x = 171.32 × 72.38
  4. Step 4: Simplify right side
    124.12x = 12,400.14
  5. Step 5: Solve for x
    x = 12,400.14/124.12
  6. Step 6: Final answer
    x = 99.90

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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.