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Finding the Fourth Proportional to 126.56, 189.77 and 39.87

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Solution

The fourth proportional to 126.56, 189.77 and 39.87 is: 59.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.56 : 189.77 = 39.87 : x
  2. Step 2: Convert to fraction form
    126.56/189.77 = 39.87/x
  3. Step 3: Cross multiply
    126.56x = 189.77 × 39.87
  4. Step 4: Simplify right side
    126.56x = 7,565.93
  5. Step 5: Solve for x
    x = 7,565.93/126.56
  6. Step 6: Final answer
    x = 59.78

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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.