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Finding the Fourth Proportional to 90,640.80, 135,961.20 and 55,211.40

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Solution

The fourth proportional to 90,640.80, 135,961.20 and 55,211.40 is: 82,817.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,640.80 : 135,961.20 = 55,211.40 : x
  2. Step 2: Convert to fraction form
    90,640.80/135,961.20 = 55,211.40/x
  3. Step 3: Cross multiply
    90,640.80x = 135,961.20 × 55,211.40
  4. Step 4: Simplify right side
    90,640.80x = 7,506,608,197.68
  5. Step 5: Solve for x
    x = 7,506,608,197.68/90,640.80
  6. Step 6: Final answer
    x = 82,817.10

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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.