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Finding the Fourth Proportional to 90,813.70, 135,961.35 and 80,445.70

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Solution

The fourth proportional to 90,813.70, 135,961.35 and 80,445.70 is: 120,438.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,813.70 : 135,961.35 = 80,445.70 : x
  2. Step 2: Convert to fraction form
    90,813.70/135,961.35 = 80,445.70/x
  3. Step 3: Cross multiply
    90,813.70x = 135,961.35 × 80,445.70
  4. Step 4: Simplify right side
    90,813.70x = 10,937,505,973.70
  5. Step 5: Solve for x
    x = 10,937,505,973.70/90,813.70
  6. Step 6: Final answer
    x = 120,438.94

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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.