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Finding the Fourth Proportional to 124.16, 171.28 and 72.40

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Solution

The fourth proportional to 124.16, 171.28 and 72.40 is: 99.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.16 : 171.28 = 72.40 : x
  2. Step 2: Convert to fraction form
    124.16/171.28 = 72.40/x
  3. Step 3: Cross multiply
    124.16x = 171.28 × 72.40
  4. Step 4: Simplify right side
    124.16x = 12,400.67
  5. Step 5: Solve for x
    x = 12,400.67/124.16
  6. Step 6: Final answer
    x = 99.88

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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.