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Finding the Fourth Proportional to 127.48, 175.91 and 72.20

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Solution

The fourth proportional to 127.48, 175.91 and 72.20 is: 99.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.48 : 175.91 = 72.20 : x
  2. Step 2: Convert to fraction form
    127.48/175.91 = 72.20/x
  3. Step 3: Cross multiply
    127.48x = 175.91 × 72.20
  4. Step 4: Simplify right side
    127.48x = 12,700.34
  5. Step 5: Solve for x
    x = 12,700.34/127.48
  6. Step 6: Final answer
    x = 99.63

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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.