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Finding the Fourth Proportional to 663,399.69, 915,491.84 and 376,920.15

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Solution

The fourth proportional to 663,399.69, 915,491.84 and 376,920.15 is: 520,149.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,399.69 : 915,491.84 = 376,920.15 : x
  2. Step 2: Convert to fraction form
    663,399.69/915,491.84 = 376,920.15/x
  3. Step 3: Cross multiply
    663,399.69x = 915,491.84 × 376,920.15
  4. Step 4: Simplify right side
    663,399.69x = 345,067,319,771.98
  5. Step 5: Solve for x
    x = 345,067,319,771.98/663,399.69
  6. Step 6: Final answer
    x = 520,149.96

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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.