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Finding the Fourth Proportional to 126.12, 189.03 and 52.92

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Solution

The fourth proportional to 126.12, 189.03 and 52.92 is: 79.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.12 : 189.03 = 52.92 : x
  2. Step 2: Convert to fraction form
    126.12/189.03 = 52.92/x
  3. Step 3: Cross multiply
    126.12x = 189.03 × 52.92
  4. Step 4: Simplify right side
    126.12x = 10,003.47
  5. Step 5: Solve for x
    x = 10,003.47/126.12
  6. Step 6: Final answer
    x = 79.32

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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.