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Finding the Fourth Proportional to 127.09, 175.75 and 124.78

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Solution

The fourth proportional to 127.09, 175.75 and 124.78 is: 172.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.09 : 175.75 = 124.78 : x
  2. Step 2: Convert to fraction form
    127.09/175.75 = 124.78/x
  3. Step 3: Cross multiply
    127.09x = 175.75 × 124.78
  4. Step 4: Simplify right side
    127.09x = 21,930.86
  5. Step 5: Solve for x
    x = 21,930.86/127.09
  6. Step 6: Final answer
    x = 172.56

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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.