Home / 20,687.72-31,025.10-10,821.80

Finding the Fourth Proportional to 20,687.72, 31,025.10 and 10,821.80

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Solution

The fourth proportional to 20,687.72, 31,025.10 and 10,821.80 is: 16,229.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,687.72 : 31,025.10 = 10,821.80 : x
  2. Step 2: Convert to fraction form
    20,687.72/31,025.10 = 10,821.80/x
  3. Step 3: Cross multiply
    20,687.72x = 31,025.10 × 10,821.80
  4. Step 4: Simplify right side
    20,687.72x = 335,747,427.18
  5. Step 5: Solve for x
    x = 335,747,427.18/20,687.72
  6. Step 6: Final answer
    x = 16,229.31

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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.