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Finding the Fourth Proportional to 127.24, 190.50 and 81.48

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Solution

The fourth proportional to 127.24, 190.50 and 81.48 is: 121.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.24 : 190.50 = 81.48 : x
  2. Step 2: Convert to fraction form
    127.24/190.50 = 81.48/x
  3. Step 3: Cross multiply
    127.24x = 190.50 × 81.48
  4. Step 4: Simplify right side
    127.24x = 15,521.94
  5. Step 5: Solve for x
    x = 15,521.94/127.24
  6. Step 6: Final answer
    x = 121.99

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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.