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Finding the Fourth Proportional to 125.17, 172.72 and 80.92

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Solution

The fourth proportional to 125.17, 172.72 and 80.92 is: 111.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.17 : 172.72 = 80.92 : x
  2. Step 2: Convert to fraction form
    125.17/172.72 = 80.92/x
  3. Step 3: Cross multiply
    125.17x = 172.72 × 80.92
  4. Step 4: Simplify right side
    125.17x = 13,976.50
  5. Step 5: Solve for x
    x = 13,976.50/125.17
  6. Step 6: Final answer
    x = 111.66

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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.