Home / 812,478.87-1,121,220.13-449,902.71

Finding the Fourth Proportional to 812,478.87, 1,121,220.13 and 449,902.71

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Solution

The fourth proportional to 812,478.87, 1,121,220.13 and 449,902.71 is: 620,865.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    812,478.87 : 1,121,220.13 = 449,902.71 : x
  2. Step 2: Convert to fraction form
    812,478.87/1,121,220.13 = 449,902.71/x
  3. Step 3: Cross multiply
    812,478.87x = 1,121,220.13 × 449,902.71
  4. Step 4: Simplify right side
    812,478.87x = 504,439,974,993.55
  5. Step 5: Solve for x
    x = 504,439,974,993.55/812,478.87
  6. Step 6: Final answer
    x = 620,865.35

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Half scale
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Double scale
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Similar ratio
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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.