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Finding the Fourth Proportional to 127.74, 191.91 and 82.17

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Solution

The fourth proportional to 127.74, 191.91 and 82.17 is: 123.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.74 : 191.91 = 82.17 : x
  2. Step 2: Convert to fraction form
    127.74/191.91 = 82.17/x
  3. Step 3: Cross multiply
    127.74x = 191.91 × 82.17
  4. Step 4: Simplify right side
    127.74x = 15,769.24
  5. Step 5: Solve for x
    x = 15,769.24/127.74
  6. Step 6: Final answer
    x = 123.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.