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Finding the Fourth Proportional to 127.42, 191.26 and 120.49

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Solution

The fourth proportional to 127.42, 191.26 and 120.49 is: 180.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.42 : 191.26 = 120.49 : x
  2. Step 2: Convert to fraction form
    127.42/191.26 = 120.49/x
  3. Step 3: Cross multiply
    127.42x = 191.26 × 120.49
  4. Step 4: Simplify right side
    127.42x = 23,044.92
  5. Step 5: Solve for x
    x = 23,044.92/127.42
  6. Step 6: Final answer
    x = 180.86

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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.