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Finding the Fourth Proportional to 663,739.21, 915,958.41 and 361,933.21

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Solution

The fourth proportional to 663,739.21, 915,958.41 and 361,933.21 is: 499,466.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,739.21 : 915,958.41 = 361,933.21 : x
  2. Step 2: Convert to fraction form
    663,739.21/915,958.41 = 361,933.21/x
  3. Step 3: Cross multiply
    663,739.21x = 915,958.41 × 361,933.21
  4. Step 4: Simplify right side
    663,739.21x = 331,515,767,557.80
  5. Step 5: Solve for x
    x = 331,515,767,557.80/663,739.21
  6. Step 6: Final answer
    x = 499,466.90

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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.