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Finding the Fourth Proportional to 663,321.80, 915,408.60 and 376,890.68

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Solution

The fourth proportional to 663,321.80, 915,408.60 and 376,890.68 is: 520,123.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,321.80 : 915,408.60 = 376,890.68 : x
  2. Step 2: Convert to fraction form
    663,321.80/915,408.60 = 376,890.68/x
  3. Step 3: Cross multiply
    663,321.80x = 915,408.60 × 376,890.68
  4. Step 4: Simplify right side
    663,321.80x = 345,008,969,731.85
  5. Step 5: Solve for x
    x = 345,008,969,731.85/663,321.80
  6. Step 6: Final answer
    x = 520,123.07

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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.