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Finding the Fourth Proportional to 127.71, 174.91 and 123.61

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Solution

The fourth proportional to 127.71, 174.91 and 123.61 is: 169.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.71 : 174.91 = 123.61 : x
  2. Step 2: Convert to fraction form
    127.71/174.91 = 123.61/x
  3. Step 3: Cross multiply
    127.71x = 174.91 × 123.61
  4. Step 4: Simplify right side
    127.71x = 21,620.63
  5. Step 5: Solve for x
    x = 21,620.63/127.71
  6. Step 6: Final answer
    x = 169.29

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.