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Finding the Fourth Proportional to 90,799.70, 135,940.35 and 80,431.70

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Solution

The fourth proportional to 90,799.70, 135,940.35 and 80,431.70 is: 120,417.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,799.70 : 135,940.35 = 80,431.70 : x
  2. Step 2: Convert to fraction form
    90,799.70/135,940.35 = 80,431.70/x
  3. Step 3: Cross multiply
    90,799.70x = 135,940.35 × 80,431.70
  4. Step 4: Simplify right side
    90,799.70x = 10,933,913,449.10
  5. Step 5: Solve for x
    x = 10,933,913,449.10/90,799.70
  6. Step 6: Final answer
    x = 120,417.95

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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.