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Finding the Fourth Proportional to 80,939.70, 121,409.55 and 45,947.70

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Solution

The fourth proportional to 80,939.70, 121,409.55 and 45,947.70 is: 68,921.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,939.70 : 121,409.55 = 45,947.70 : x
  2. Step 2: Convert to fraction form
    80,939.70/121,409.55 = 45,947.70/x
  3. Step 3: Cross multiply
    80,939.70x = 121,409.55 × 45,947.70
  4. Step 4: Simplify right side
    80,939.70x = 5,578,489,580.54
  5. Step 5: Solve for x
    x = 5,578,489,580.54/80,939.70
  6. Step 6: Final answer
    x = 68,921.55

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Similar ratio
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1.5x scale

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.