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Finding the Fourth Proportional to 127.15, 176.20 and 124.72

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Solution

The fourth proportional to 127.15, 176.20 and 124.72 is: 172.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.15 : 176.20 = 124.72 : x
  2. Step 2: Convert to fraction form
    127.15/176.20 = 124.72/x
  3. Step 3: Cross multiply
    127.15x = 176.20 × 124.72
  4. Step 4: Simplify right side
    127.15x = 21,975.66
  5. Step 5: Solve for x
    x = 21,975.66/127.15
  6. Step 6: Final answer
    x = 172.83

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.