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Finding the Fourth Proportional to 126.46, 172.09 and 125.85

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Solution

The fourth proportional to 126.46, 172.09 and 125.85 is: 171.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.46 : 172.09 = 125.85 : x
  2. Step 2: Convert to fraction form
    126.46/172.09 = 125.85/x
  3. Step 3: Cross multiply
    126.46x = 172.09 × 125.85
  4. Step 4: Simplify right side
    126.46x = 21,657.53
  5. Step 5: Solve for x
    x = 21,657.53/126.46
  6. Step 6: Final answer
    x = 171.26

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.