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Finding the Fourth Proportional to 127.91, 176.55 and 81.31

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Solution

The fourth proportional to 127.91, 176.55 and 81.31 is: 112.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.91 : 176.55 = 81.31 : x
  2. Step 2: Convert to fraction form
    127.91/176.55 = 81.31/x
  3. Step 3: Cross multiply
    127.91x = 176.55 × 81.31
  4. Step 4: Simplify right side
    127.91x = 14,355.28
  5. Step 5: Solve for x
    x = 14,355.28/127.91
  6. Step 6: Final answer
    x = 112.23

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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.