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Finding the Fourth Proportional to 127.43, 175.88 and 72.20

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Solution

The fourth proportional to 127.43, 175.88 and 72.20 is: 99.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.43 : 175.88 = 72.20 : x
  2. Step 2: Convert to fraction form
    127.43/175.88 = 72.20/x
  3. Step 3: Cross multiply
    127.43x = 175.88 × 72.20
  4. Step 4: Simplify right side
    127.43x = 12,698.54
  5. Step 5: Solve for x
    x = 12,698.54/127.43
  6. Step 6: Final answer
    x = 99.65

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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.