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Finding the Fourth Proportional to 127.12, 175.42 and 71.86

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Solution

The fourth proportional to 127.12, 175.42 and 71.86 is: 99.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.12 : 175.42 = 71.86 : x
  2. Step 2: Convert to fraction form
    127.12/175.42 = 71.86/x
  3. Step 3: Cross multiply
    127.12x = 175.42 × 71.86
  4. Step 4: Simplify right side
    127.12x = 12,605.68
  5. Step 5: Solve for x
    x = 12,605.68/127.12
  6. Step 6: Final answer
    x = 99.16

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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.