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Finding the Fourth Proportional to 127.28, 175.55 and 80.60

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Solution

The fourth proportional to 127.28, 175.55 and 80.60 is: 111.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.28 : 175.55 = 80.60 : x
  2. Step 2: Convert to fraction form
    127.28/175.55 = 80.60/x
  3. Step 3: Cross multiply
    127.28x = 175.55 × 80.60
  4. Step 4: Simplify right side
    127.28x = 14,149.98
  5. Step 5: Solve for x
    x = 14,149.98/127.28
  6. Step 6: Final answer
    x = 111.17

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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.