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Finding the Fourth Proportional to 90,195.40, 135,339.79 and 65,439.78

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Solution

The fourth proportional to 90,195.40, 135,339.79 and 65,439.78 is: 98,193.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,195.40 : 135,339.79 = 65,439.78 : x
  2. Step 2: Convert to fraction form
    90,195.40/135,339.79 = 65,439.78/x
  3. Step 3: Cross multiply
    90,195.40x = 135,339.79 × 65,439.78
  4. Step 4: Simplify right side
    90,195.40x = 8,856,606,082.85
  5. Step 5: Solve for x
    x = 8,856,606,082.85/90,195.40
  6. Step 6: Final answer
    x = 98,193.55

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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.