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Finding the Fourth Proportional to 279,138.72, 418,645.20 and 79,454.70

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Solution

The fourth proportional to 279,138.72, 418,645.20 and 79,454.70 is: 119,164.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,138.72 : 418,645.20 = 79,454.70 : x
  2. Step 2: Convert to fraction form
    279,138.72/418,645.20 = 79,454.70/x
  3. Step 3: Cross multiply
    279,138.72x = 418,645.20 × 79,454.70
  4. Step 4: Simplify right side
    279,138.72x = 33,263,328,772.44
  5. Step 5: Solve for x
    x = 33,263,328,772.44/279,138.72
  6. Step 6: Final answer
    x = 119,164.15

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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.