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Finding the Fourth Proportional to 521,074.80, 781,903.80 and 221,504.40

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Solution

The fourth proportional to 521,074.80, 781,903.80 and 221,504.40 is: 332,380.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,074.80 : 781,903.80 = 221,504.40 : x
  2. Step 2: Convert to fraction form
    521,074.80/781,903.80 = 221,504.40/x
  3. Step 3: Cross multiply
    521,074.80x = 781,903.80 × 221,504.40
  4. Step 4: Simplify right side
    521,074.80x = 173,195,132,076.72
  5. Step 5: Solve for x
    x = 173,195,132,076.72/521,074.80
  6. Step 6: Final answer
    x = 332,380.56

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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.