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Finding the Fourth Proportional to 127.39, 175.79 and 72.13

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Solution

The fourth proportional to 127.39, 175.79 and 72.13 is: 99.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.39 : 175.79 = 72.13 : x
  2. Step 2: Convert to fraction form
    127.39/175.79 = 72.13/x
  3. Step 3: Cross multiply
    127.39x = 175.79 × 72.13
  4. Step 4: Simplify right side
    127.39x = 12,679.73
  5. Step 5: Solve for x
    x = 12,679.73/127.39
  6. Step 6: Final answer
    x = 99.54

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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.