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Finding the Fourth Proportional to 213,621.60, 320,432.40 and 204,520.80

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Solution

The fourth proportional to 213,621.60, 320,432.40 and 204,520.80 is: 306,781.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,621.60 : 320,432.40 = 204,520.80 : x
  2. Step 2: Convert to fraction form
    213,621.60/320,432.40 = 204,520.80/x
  3. Step 3: Cross multiply
    213,621.60x = 320,432.40 × 204,520.80
  4. Step 4: Simplify right side
    213,621.60x = 65,535,090,793.92
  5. Step 5: Solve for x
    x = 65,535,090,793.92/213,621.60
  6. Step 6: Final answer
    x = 306,781.20

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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.