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Finding the Fourth Proportional to 126.42, 188.75 and 108.19

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Solution

The fourth proportional to 126.42, 188.75 and 108.19 is: 161.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.42 : 188.75 = 108.19 : x
  2. Step 2: Convert to fraction form
    126.42/188.75 = 108.19/x
  3. Step 3: Cross multiply
    126.42x = 188.75 × 108.19
  4. Step 4: Simplify right side
    126.42x = 20,420.86
  5. Step 5: Solve for x
    x = 20,420.86/126.42
  6. Step 6: Final answer
    x = 161.53

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.