Home / 12,387.38-18,572.49-4,989.78

Finding the Fourth Proportional to 12,387.38, 18,572.49 and 4,989.78

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Solution

The fourth proportional to 12,387.38, 18,572.49 and 4,989.78 is: 7,481.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,387.38 : 18,572.49 = 4,989.78 : x
  2. Step 2: Convert to fraction form
    12,387.38/18,572.49 = 4,989.78/x
  3. Step 3: Cross multiply
    12,387.38x = 18,572.49 × 4,989.78
  4. Step 4: Simplify right side
    12,387.38x = 92,672,639.15
  5. Step 5: Solve for x
    x = 92,672,639.15/12,387.38
  6. Step 6: Final answer
    x = 7,481.22

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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.