Home / 20,939.82-31,418.40-8,468.70

Finding the Fourth Proportional to 20,939.82, 31,418.40 and 8,468.70

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Solution

The fourth proportional to 20,939.82, 31,418.40 and 8,468.70 is: 12,706.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,939.82 : 31,418.40 = 8,468.70 : x
  2. Step 2: Convert to fraction form
    20,939.82/31,418.40 = 8,468.70/x
  3. Step 3: Cross multiply
    20,939.82x = 31,418.40 × 8,468.70
  4. Step 4: Simplify right side
    20,939.82x = 266,073,004.08
  5. Step 5: Solve for x
    x = 266,073,004.08/20,939.82
  6. Step 6: Final answer
    x = 12,706.56

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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.