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Finding the Fourth Proportional to 278,879.10, 418,318.65 and 68,514.30

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Solution

The fourth proportional to 278,879.10, 418,318.65 and 68,514.30 is: 102,771.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,879.10 : 418,318.65 = 68,514.30 : x
  2. Step 2: Convert to fraction form
    278,879.10/418,318.65 = 68,514.30/x
  3. Step 3: Cross multiply
    278,879.10x = 418,318.65 × 68,514.30
  4. Step 4: Simplify right side
    278,879.10x = 28,660,809,481.70
  5. Step 5: Solve for x
    x = 28,660,809,481.70/278,879.10
  6. Step 6: Final answer
    x = 102,771.45

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1.5x scale

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.