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Finding the Fourth Proportional to 221,790.60, 332,685.90 and 81,520.20

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Solution

The fourth proportional to 221,790.60, 332,685.90 and 81,520.20 is: 122,280.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,790.60 : 332,685.90 = 81,520.20 : x
  2. Step 2: Convert to fraction form
    221,790.60/332,685.90 = 81,520.20/x
  3. Step 3: Cross multiply
    221,790.60x = 332,685.90 × 81,520.20
  4. Step 4: Simplify right side
    221,790.60x = 27,120,621,105.18
  5. Step 5: Solve for x
    x = 27,120,621,105.18/221,790.60
  6. Step 6: Final answer
    x = 122,280.30

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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.