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Finding the Fourth Proportional to 126.28, 189.40 and 57.76

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Solution

The fourth proportional to 126.28, 189.40 and 57.76 is: 86.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.28 : 189.40 = 57.76 : x
  2. Step 2: Convert to fraction form
    126.28/189.40 = 57.76/x
  3. Step 3: Cross multiply
    126.28x = 189.40 × 57.76
  4. Step 4: Simplify right side
    126.28x = 10,939.74
  5. Step 5: Solve for x
    x = 10,939.74/126.28
  6. Step 6: Final answer
    x = 86.63

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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.