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Finding the Fourth Proportional to 278,956.53, 418,179.65 and 121,128.03

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Solution

The fourth proportional to 278,956.53, 418,179.65 and 121,128.03 is: 181,581.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,956.53 : 418,179.65 = 121,128.03 : x
  2. Step 2: Convert to fraction form
    278,956.53/418,179.65 = 121,128.03/x
  3. Step 3: Cross multiply
    278,956.53x = 418,179.65 × 121,128.03
  4. Step 4: Simplify right side
    278,956.53x = 50,653,276,584.95
  5. Step 5: Solve for x
    x = 50,653,276,584.95/278,956.53
  6. Step 6: Final answer
    x = 181,581.25

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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.