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Finding the Fourth Proportional to 85,540.20, 128,310.30 and 82,259.70

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Solution

The fourth proportional to 85,540.20, 128,310.30 and 82,259.70 is: 123,389.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,540.20 : 128,310.30 = 82,259.70 : x
  2. Step 2: Convert to fraction form
    85,540.20/128,310.30 = 82,259.70/x
  3. Step 3: Cross multiply
    85,540.20x = 128,310.30 × 82,259.70
  4. Step 4: Simplify right side
    85,540.20x = 10,554,766,784.91
  5. Step 5: Solve for x
    x = 10,554,766,784.91/85,540.20
  6. Step 6: Final answer
    x = 123,389.55

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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.