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Finding the Fourth Proportional to 127.70, 176.09 and 86.28

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Solution

The fourth proportional to 127.70, 176.09 and 86.28 is: 118.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.70 : 176.09 = 86.28 : x
  2. Step 2: Convert to fraction form
    127.70/176.09 = 86.28/x
  3. Step 3: Cross multiply
    127.70x = 176.09 × 86.28
  4. Step 4: Simplify right side
    127.70x = 15,192.61
  5. Step 5: Solve for x
    x = 15,192.61/127.70
  6. Step 6: Final answer
    x = 118.98

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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.