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Finding the Fourth Proportional to 278,789.70, 418,512.60 and 276,821.40

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Solution

The fourth proportional to 278,789.70, 418,512.60 and 276,821.40 is: 415,557.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,789.70 : 418,512.60 = 276,821.40 : x
  2. Step 2: Convert to fraction form
    278,789.70/418,512.60 = 276,821.40/x
  3. Step 3: Cross multiply
    278,789.70x = 418,512.60 × 276,821.40
  4. Step 4: Simplify right side
    278,789.70x = 115,853,243,849.64
  5. Step 5: Solve for x
    x = 115,853,243,849.64/278,789.70
  6. Step 6: Final answer
    x = 415,557.83

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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.