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Finding the Fourth Proportional to 278,687.39, 418,032.50 and 68,325.53

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Solution

The fourth proportional to 278,687.39, 418,032.50 and 68,325.53 is: 102,488.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,687.39 : 418,032.50 = 68,325.53 : x
  2. Step 2: Convert to fraction form
    278,687.39/418,032.50 = 68,325.53/x
  3. Step 3: Cross multiply
    278,687.39x = 418,032.50 × 68,325.53
  4. Step 4: Simplify right side
    278,687.39x = 28,562,289,687.93
  5. Step 5: Solve for x
    x = 28,562,289,687.93/278,687.39
  6. Step 6: Final answer
    x = 102,488.64

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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.