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Finding the Fourth Proportional to 127.43, 190.80 and 81.53

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Solution

The fourth proportional to 127.43, 190.80 and 81.53 is: 122.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.43 : 190.80 = 81.53 : x
  2. Step 2: Convert to fraction form
    127.43/190.80 = 81.53/x
  3. Step 3: Cross multiply
    127.43x = 190.80 × 81.53
  4. Step 4: Simplify right side
    127.43x = 15,554.97
  5. Step 5: Solve for x
    x = 15,554.97/127.43
  6. Step 6: Final answer
    x = 122.07

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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.