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Finding the Fourth Proportional to 279,260.22, 418,890.32 and 129,480.78

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Solution

The fourth proportional to 279,260.22, 418,890.32 and 129,480.78 is: 194,221.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,260.22 : 418,890.32 = 129,480.78 : x
  2. Step 2: Convert to fraction form
    279,260.22/418,890.32 = 129,480.78/x
  3. Step 3: Cross multiply
    279,260.22x = 418,890.32 × 129,480.78
  4. Step 4: Simplify right side
    279,260.22x = 54,238,244,720.65
  5. Step 5: Solve for x
    x = 54,238,244,720.65/279,260.22
  6. Step 6: Final answer
    x = 194,221.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.