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Finding the Fourth Proportional to 126.27, 188.64 and 80.25

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Solution

The fourth proportional to 126.27, 188.64 and 80.25 is: 119.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.27 : 188.64 = 80.25 : x
  2. Step 2: Convert to fraction form
    126.27/188.64 = 80.25/x
  3. Step 3: Cross multiply
    126.27x = 188.64 × 80.25
  4. Step 4: Simplify right side
    126.27x = 15,138.36
  5. Step 5: Solve for x
    x = 15,138.36/126.27
  6. Step 6: Final answer
    x = 119.89

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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.