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Finding the Fourth Proportional to 91,969.85, 126,920.92 and 51,687.28

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Solution

The fourth proportional to 91,969.85, 126,920.92 and 51,687.28 is: 71,329.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,969.85 : 126,920.92 = 51,687.28 : x
  2. Step 2: Convert to fraction form
    91,969.85/126,920.92 = 51,687.28/x
  3. Step 3: Cross multiply
    91,969.85x = 126,920.92 × 51,687.28
  4. Step 4: Simplify right side
    91,969.85x = 6,560,197,129.90
  5. Step 5: Solve for x
    x = 6,560,197,129.90/91,969.85
  6. Step 6: Final answer
    x = 71,329.87

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1.5x scale

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.