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Finding the Fourth Proportional to 221,720.80, 332,581.20 and 209,473.60

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Solution

The fourth proportional to 221,720.80, 332,581.20 and 209,473.60 is: 314,210.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,720.80 : 332,581.20 = 209,473.60 : x
  2. Step 2: Convert to fraction form
    221,720.80/332,581.20 = 209,473.60/x
  3. Step 3: Cross multiply
    221,720.80x = 332,581.20 × 209,473.60
  4. Step 4: Simplify right side
    221,720.80x = 69,666,981,256.32
  5. Step 5: Solve for x
    x = 69,666,981,256.32/221,720.80
  6. Step 6: Final answer
    x = 314,210.40

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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.