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Finding the Fourth Proportional to 127.45, 191.10 and 86.92

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Solution

The fourth proportional to 127.45, 191.10 and 86.92 is: 130.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.45 : 191.10 = 86.92 : x
  2. Step 2: Convert to fraction form
    127.45/191.10 = 86.92/x
  3. Step 3: Cross multiply
    127.45x = 191.10 × 86.92
  4. Step 4: Simplify right side
    127.45x = 16,609.93
  5. Step 5: Solve for x
    x = 16,609.93/127.45
  6. Step 6: Final answer
    x = 130.33

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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.