Home / 90,631.70-135,947.55-81,446.30

Finding the Fourth Proportional to 90,631.70, 135,947.55 and 81,446.30

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Solution

The fourth proportional to 90,631.70, 135,947.55 and 81,446.30 is: 122,169.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,631.70 : 135,947.55 = 81,446.30 : x
  2. Step 2: Convert to fraction form
    90,631.70/135,947.55 = 81,446.30/x
  3. Step 3: Cross multiply
    90,631.70x = 135,947.55 × 81,446.30
  4. Step 4: Simplify right side
    90,631.70x = 11,072,424,941.57
  5. Step 5: Solve for x
    x = 11,072,424,941.57/90,631.70
  6. Step 6: Final answer
    x = 122,169.45

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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.