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Finding the Fourth Proportional to 127.44, 175.76 and 90.60

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Solution

The fourth proportional to 127.44, 175.76 and 90.60 is: 124.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.44 : 175.76 = 90.60 : x
  2. Step 2: Convert to fraction form
    127.44/175.76 = 90.60/x
  3. Step 3: Cross multiply
    127.44x = 175.76 × 90.60
  4. Step 4: Simplify right side
    127.44x = 15,923.86
  5. Step 5: Solve for x
    x = 15,923.86/127.44
  6. Step 6: Final answer
    x = 124.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.