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Finding the Fourth Proportional to 127.56, 176.11 and 80.94

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Solution

The fourth proportional to 127.56, 176.11 and 80.94 is: 111.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.56 : 176.11 = 80.94 : x
  2. Step 2: Convert to fraction form
    127.56/176.11 = 80.94/x
  3. Step 3: Cross multiply
    127.56x = 176.11 × 80.94
  4. Step 4: Simplify right side
    127.56x = 14,254.34
  5. Step 5: Solve for x
    x = 14,254.34/127.56
  6. Step 6: Final answer
    x = 111.75

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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.