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Finding the Fourth Proportional to 278,470.38, 417,638.67 and 128,566.72

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Solution

The fourth proportional to 278,470.38, 417,638.67 and 128,566.72 is: 192,819.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,470.38 : 417,638.67 = 128,566.72 : x
  2. Step 2: Convert to fraction form
    278,470.38/417,638.67 = 128,566.72/x
  3. Step 3: Cross multiply
    278,470.38x = 417,638.67 × 128,566.72
  4. Step 4: Simplify right side
    278,470.38x = 53,694,433,947.06
  5. Step 5: Solve for x
    x = 53,694,433,947.06/278,470.38
  6. Step 6: Final answer
    x = 192,819.19

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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.