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Finding the Fourth Proportional to 126.21, 189.31 and 49.15

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Solution

The fourth proportional to 126.21, 189.31 and 49.15 is: 73.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.21 : 189.31 = 49.15 : x
  2. Step 2: Convert to fraction form
    126.21/189.31 = 49.15/x
  3. Step 3: Cross multiply
    126.21x = 189.31 × 49.15
  4. Step 4: Simplify right side
    126.21x = 9,304.80
  5. Step 5: Solve for x
    x = 9,304.80/126.21
  6. Step 6: Final answer
    x = 73.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.