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Finding the Fourth Proportional to 125.17, 172.79 and 92.66

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Solution

The fourth proportional to 125.17, 172.79 and 92.66 is: 127.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.17 : 172.79 = 92.66 : x
  2. Step 2: Convert to fraction form
    125.17/172.79 = 92.66/x
  3. Step 3: Cross multiply
    125.17x = 172.79 × 92.66
  4. Step 4: Simplify right side
    125.17x = 16,010.26
  5. Step 5: Solve for x
    x = 16,010.26/125.17
  6. Step 6: Final answer
    x = 127.91

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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.