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Finding the Fourth Proportional to 126.12, 189.13 and 74.87

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Solution

The fourth proportional to 126.12, 189.13 and 74.87 is: 112.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.12 : 189.13 = 74.87 : x
  2. Step 2: Convert to fraction form
    126.12/189.13 = 74.87/x
  3. Step 3: Cross multiply
    126.12x = 189.13 × 74.87
  4. Step 4: Simplify right side
    126.12x = 14,160.16
  5. Step 5: Solve for x
    x = 14,160.16/126.12
  6. Step 6: Final answer
    x = 112.28

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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.