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Finding the Fourth Proportional to 215,520.60, 323,280.90 and 82,405.20

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Solution

The fourth proportional to 215,520.60, 323,280.90 and 82,405.20 is: 123,607.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,520.60 : 323,280.90 = 82,405.20 : x
  2. Step 2: Convert to fraction form
    215,520.60/323,280.90 = 82,405.20/x
  3. Step 3: Cross multiply
    215,520.60x = 323,280.90 × 82,405.20
  4. Step 4: Simplify right side
    215,520.60x = 26,640,027,220.68
  5. Step 5: Solve for x
    x = 26,640,027,220.68/215,520.60
  6. Step 6: Final answer
    x = 123,607.80

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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.