Home / 812,479.89-1,121,221.55-449,903.73

Finding the Fourth Proportional to 812,479.89, 1,121,221.55 and 449,903.73

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Solution

The fourth proportional to 812,479.89, 1,121,221.55 and 449,903.73 is: 620,866.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    812,479.89 : 1,121,221.55 = 449,903.73 : x
  2. Step 2: Convert to fraction form
    812,479.89/1,121,221.55 = 449,903.73/x
  3. Step 3: Cross multiply
    812,479.89x = 1,121,221.55 × 449,903.73
  4. Step 4: Simplify right side
    812,479.89x = 504,441,755,251.86
  5. Step 5: Solve for x
    x = 504,441,755,251.86/812,479.89
  6. Step 6: Final answer
    x = 620,866.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.