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Finding the Fourth Proportional to 667,418.12, 921,029.64 and 361,486.88

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Solution

The fourth proportional to 667,418.12, 921,029.64 and 361,486.88 is: 498,847.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,418.12 : 921,029.64 = 361,486.88 : x
  2. Step 2: Convert to fraction form
    667,418.12/921,029.64 = 361,486.88/x
  3. Step 3: Cross multiply
    667,418.12x = 921,029.64 × 361,486.88
  4. Step 4: Simplify right side
    667,418.12x = 332,940,130,951.12
  5. Step 5: Solve for x
    x = 332,940,130,951.12/667,418.12
  6. Step 6: Final answer
    x = 498,847.91

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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.