Home / 20,680.20-31,020.30-18,217.80

Finding the Fourth Proportional to 20,680.20, 31,020.30 and 18,217.80

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Solution

The fourth proportional to 20,680.20, 31,020.30 and 18,217.80 is: 27,326.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,680.20 : 31,020.30 = 18,217.80 : x
  2. Step 2: Convert to fraction form
    20,680.20/31,020.30 = 18,217.80/x
  3. Step 3: Cross multiply
    20,680.20x = 31,020.30 × 18,217.80
  4. Step 4: Simplify right side
    20,680.20x = 565,121,621.34
  5. Step 5: Solve for x
    x = 565,121,621.34/20,680.20
  6. Step 6: Final answer
    x = 27,326.70

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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.