Home / 20,939.85-31,414.41-6,899.31

Finding the Fourth Proportional to 20,939.85, 31,414.41 and 6,899.31

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Solution

The fourth proportional to 20,939.85, 31,414.41 and 6,899.31 is: 10,350.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,939.85 : 31,414.41 = 6,899.31 : x
  2. Step 2: Convert to fraction form
    20,939.85/31,414.41 = 6,899.31/x
  3. Step 3: Cross multiply
    20,939.85x = 31,414.41 × 6,899.31
  4. Step 4: Simplify right side
    20,939.85x = 216,737,753.06
  5. Step 5: Solve for x
    x = 216,737,753.06/20,939.85
  6. Step 6: Final answer
    x = 10,350.49

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1.5x scale

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.