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Finding the Fourth Proportional to 278,957.28, 418,180.77 and 121,128.78

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Solution

The fourth proportional to 278,957.28, 418,180.77 and 121,128.78 is: 181,582.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,957.28 : 418,180.77 = 121,128.78 : x
  2. Step 2: Convert to fraction form
    278,957.28/418,180.77 = 121,128.78/x
  3. Step 3: Cross multiply
    278,957.28x = 418,180.77 × 121,128.78
  4. Step 4: Simplify right side
    278,957.28x = 50,653,726,489.56
  5. Step 5: Solve for x
    x = 50,653,726,489.56/278,957.28
  6. Step 6: Final answer
    x = 181,582.38

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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.