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Finding the Fourth Proportional to 91,432.50, 126,170.90 and 51,139.28

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Solution

The fourth proportional to 91,432.50, 126,170.90 and 51,139.28 is: 70,568.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,432.50 : 126,170.90 = 51,139.28 : x
  2. Step 2: Convert to fraction form
    91,432.50/126,170.90 = 51,139.28/x
  3. Step 3: Cross multiply
    91,432.50x = 126,170.90 × 51,139.28
  4. Step 4: Simplify right side
    91,432.50x = 6,452,288,982.95
  5. Step 5: Solve for x
    x = 6,452,288,982.95/91,432.50
  6. Step 6: Final answer
    x = 70,568.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.