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Finding the Fourth Proportional to 127.60, 191.01 and 86.89

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Solution

The fourth proportional to 127.60, 191.01 and 86.89 is: 130.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.60 : 191.01 = 86.89 : x
  2. Step 2: Convert to fraction form
    127.60/191.01 = 86.89/x
  3. Step 3: Cross multiply
    127.60x = 191.01 × 86.89
  4. Step 4: Simplify right side
    127.60x = 16,596.86
  5. Step 5: Solve for x
    x = 16,596.86/127.60
  6. Step 6: Final answer
    x = 130.07

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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.