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Finding the Fourth Proportional to 127.34, 191.10 and 86.80

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Solution

The fourth proportional to 127.34, 191.10 and 86.80 is: 130.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.34 : 191.10 = 86.80 : x
  2. Step 2: Convert to fraction form
    127.34/191.10 = 86.80/x
  3. Step 3: Cross multiply
    127.34x = 191.10 × 86.80
  4. Step 4: Simplify right side
    127.34x = 16,587.48
  5. Step 5: Solve for x
    x = 16,587.48/127.34
  6. Step 6: Final answer
    x = 130.27

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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.