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Finding the Fourth Proportional to 663,645.80, 915,832.12 and 361,839.80

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Solution

The fourth proportional to 663,645.80, 915,832.12 and 361,839.80 is: 499,339.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,645.80 : 915,832.12 = 361,839.80 : x
  2. Step 2: Convert to fraction form
    663,645.80/915,832.12 = 361,839.80/x
  3. Step 3: Cross multiply
    663,645.80x = 915,832.12 × 361,839.80
  4. Step 4: Simplify right side
    663,645.80x = 331,384,511,134.38
  5. Step 5: Solve for x
    x = 331,384,511,134.38/663,645.80
  6. Step 6: Final answer
    x = 499,339.42

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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.