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Finding the Fourth Proportional to 126.81, 174.74 and 108.32

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Solution

The fourth proportional to 126.81, 174.74 and 108.32 is: 149.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.81 : 174.74 = 108.32 : x
  2. Step 2: Convert to fraction form
    126.81/174.74 = 108.32/x
  3. Step 3: Cross multiply
    126.81x = 174.74 × 108.32
  4. Step 4: Simplify right side
    126.81x = 18,926.42
  5. Step 5: Solve for x
    x = 18,926.42/126.81
  6. Step 6: Final answer
    x = 149.25

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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.