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Finding the Fourth Proportional to 127.42, 175.94 and 86.11

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Solution

The fourth proportional to 127.42, 175.94 and 86.11 is: 118.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.42 : 175.94 = 86.11 : x
  2. Step 2: Convert to fraction form
    127.42/175.94 = 86.11/x
  3. Step 3: Cross multiply
    127.42x = 175.94 × 86.11
  4. Step 4: Simplify right side
    127.42x = 15,149.31
  5. Step 5: Solve for x
    x = 15,149.31/127.42
  6. Step 6: Final answer
    x = 118.90

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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.