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Finding the Fourth Proportional to 278,949.63, 418,420.80 and 68,589.39

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Solution

The fourth proportional to 278,949.63, 418,420.80 and 68,589.39 is: 102,883.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,949.63 : 418,420.80 = 68,589.39 : x
  2. Step 2: Convert to fraction form
    278,949.63/418,420.80 = 68,589.39/x
  3. Step 3: Cross multiply
    278,949.63x = 418,420.80 × 68,589.39
  4. Step 4: Simplify right side
    278,949.63x = 28,699,227,435.31
  5. Step 5: Solve for x
    x = 28,699,227,435.31/278,949.63
  6. Step 6: Final answer
    x = 102,883.19

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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.