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Finding the Fourth Proportional to 278,458.27, 417,620.49 and 128,554.58

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Solution

The fourth proportional to 278,458.27, 417,620.49 and 128,554.58 is: 192,800.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,458.27 : 417,620.49 = 128,554.58 : x
  2. Step 2: Convert to fraction form
    278,458.27/417,620.49 = 128,554.58/x
  3. Step 3: Cross multiply
    278,458.27x = 417,620.49 × 128,554.58
  4. Step 4: Simplify right side
    278,458.27x = 53,687,025,627.32
  5. Step 5: Solve for x
    x = 53,687,025,627.32/278,458.27
  6. Step 6: Final answer
    x = 192,800.97

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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.