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Finding the Fourth Proportional to 124.72, 172.12 and 92.12

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Solution

The fourth proportional to 124.72, 172.12 and 92.12 is: 127.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.72 : 172.12 = 92.12 : x
  2. Step 2: Convert to fraction form
    124.72/172.12 = 92.12/x
  3. Step 3: Cross multiply
    124.72x = 172.12 × 92.12
  4. Step 4: Simplify right side
    124.72x = 15,855.69
  5. Step 5: Solve for x
    x = 15,855.69/124.72
  6. Step 6: Final answer
    x = 127.13

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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.