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Finding the Fourth Proportional to 126.74, 189.97 and 65.86

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Solution

The fourth proportional to 126.74, 189.97 and 65.86 is: 98.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.74 : 189.97 = 65.86 : x
  2. Step 2: Convert to fraction form
    126.74/189.97 = 65.86/x
  3. Step 3: Cross multiply
    126.74x = 189.97 × 65.86
  4. Step 4: Simplify right side
    126.74x = 12,511.42
  5. Step 5: Solve for x
    x = 12,511.42/126.74
  6. Step 6: Final answer
    x = 98.72

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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.