Home / 812,356.78-1,121,087.40-449,780.65

Finding the Fourth Proportional to 812,356.78, 1,121,087.40 and 449,780.65

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Solution

The fourth proportional to 812,356.78, 1,121,087.40 and 449,780.65 is: 620,716.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    812,356.78 : 1,121,087.40 = 449,780.65 : x
  2. Step 2: Convert to fraction form
    812,356.78/1,121,087.40 = 449,780.65/x
  3. Step 3: Cross multiply
    812,356.78x = 1,121,087.40 × 449,780.65
  4. Step 4: Simplify right side
    812,356.78x = 504,243,419,478.81
  5. Step 5: Solve for x
    x = 504,243,419,478.81/812,356.78
  6. Step 6: Final answer
    x = 620,716.70

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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.