Home / 521,128.20-781,109.10-221,557.80

Finding the Fourth Proportional to 521,128.20, 781,109.10 and 221,557.80

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Solution

The fourth proportional to 521,128.20, 781,109.10 and 221,557.80 is: 332,088.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,128.20 : 781,109.10 = 221,557.80 : x
  2. Step 2: Convert to fraction form
    521,128.20/781,109.10 = 221,557.80/x
  3. Step 3: Cross multiply
    521,128.20x = 781,109.10 × 221,557.80
  4. Step 4: Simplify right side
    521,128.20x = 173,060,813,755.98
  5. Step 5: Solve for x
    x = 173,060,813,755.98/521,128.20
  6. Step 6: Final answer
    x = 332,088.75

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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.