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Finding the Fourth Proportional to 126.42, 173.91 and 105.49

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Solution

The fourth proportional to 126.42, 173.91 and 105.49 is: 145.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.42 : 173.91 = 105.49 : x
  2. Step 2: Convert to fraction form
    126.42/173.91 = 105.49/x
  3. Step 3: Cross multiply
    126.42x = 173.91 × 105.49
  4. Step 4: Simplify right side
    126.42x = 18,345.77
  5. Step 5: Solve for x
    x = 18,345.77/126.42
  6. Step 6: Final answer
    x = 145.12

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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.