Home / 278,839.37-417,916.42-128,876.78

Finding the Fourth Proportional to 278,839.37, 417,916.42 and 128,876.78

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Solution

The fourth proportional to 278,839.37, 417,916.42 and 128,876.78 is: 193,156.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,839.37 : 417,916.42 = 128,876.78 : x
  2. Step 2: Convert to fraction form
    278,839.37/417,916.42 = 128,876.78/x
  3. Step 3: Cross multiply
    278,839.37x = 417,916.42 × 128,876.78
  4. Step 4: Simplify right side
    278,839.37x = 53,859,722,518.73
  5. Step 5: Solve for x
    x = 53,859,722,518.73/278,839.37
  6. Step 6: Final answer
    x = 193,156.81

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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.