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Finding the Fourth Proportional to 278,938.62, 418,172.76 and 121,048.11

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Solution

The fourth proportional to 278,938.62, 418,172.76 and 121,048.11 is: 181,470.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,938.62 : 418,172.76 = 121,048.11 : x
  2. Step 2: Convert to fraction form
    278,938.62/418,172.76 = 121,048.11/x
  3. Step 3: Cross multiply
    278,938.62x = 418,172.76 × 121,048.11
  4. Step 4: Simplify right side
    278,938.62x = 50,619,022,251.48
  5. Step 5: Solve for x
    x = 50,619,022,251.48/278,938.62
  6. Step 6: Final answer
    x = 181,470.11

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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.