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Finding the Fourth Proportional to 127.62, 175.92 and 90.72

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Solution

The fourth proportional to 127.62, 175.92 and 90.72 is: 125.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.62 : 175.92 = 90.72 : x
  2. Step 2: Convert to fraction form
    127.62/175.92 = 90.72/x
  3. Step 3: Cross multiply
    127.62x = 175.92 × 90.72
  4. Step 4: Simplify right side
    127.62x = 15,959.46
  5. Step 5: Solve for x
    x = 15,959.46/127.62
  6. Step 6: Final answer
    x = 125.05

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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.