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Finding the Fourth Proportional to 127.74, 176.34 and 81.18

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Solution

The fourth proportional to 127.74, 176.34 and 81.18 is: 112.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.74 : 176.34 = 81.18 : x
  2. Step 2: Convert to fraction form
    127.74/176.34 = 81.18/x
  3. Step 3: Cross multiply
    127.74x = 176.34 × 81.18
  4. Step 4: Simplify right side
    127.74x = 14,315.28
  5. Step 5: Solve for x
    x = 14,315.28/127.74
  6. Step 6: Final answer
    x = 112.07

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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.