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Finding the Fourth Proportional to 127.67, 176.17 and 72.40

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Solution

The fourth proportional to 127.67, 176.17 and 72.40 is: 99.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.67 : 176.17 = 72.40 : x
  2. Step 2: Convert to fraction form
    127.67/176.17 = 72.40/x
  3. Step 3: Cross multiply
    127.67x = 176.17 × 72.40
  4. Step 4: Simplify right side
    127.67x = 12,754.71
  5. Step 5: Solve for x
    x = 12,754.71/127.67
  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.