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Finding the Fourth Proportional to 127.30, 190.92 and 55.09

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Solution

The fourth proportional to 127.30, 190.92 and 55.09 is: 82.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.30 : 190.92 = 55.09 : x
  2. Step 2: Convert to fraction form
    127.30/190.92 = 55.09/x
  3. Step 3: Cross multiply
    127.30x = 190.92 × 55.09
  4. Step 4: Simplify right side
    127.30x = 10,517.78
  5. Step 5: Solve for x
    x = 10,517.78/127.30
  6. Step 6: Final answer
    x = 82.62

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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.