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Finding the Fourth Proportional to 20,982.13, 31,479.27 and 7,131.13

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Solution

The fourth proportional to 20,982.13, 31,479.27 and 7,131.13 is: 10,698.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,982.13 : 31,479.27 = 7,131.13 : x
  2. Step 2: Convert to fraction form
    20,982.13/31,479.27 = 7,131.13/x
  3. Step 3: Cross multiply
    20,982.13x = 31,479.27 × 7,131.13
  4. Step 4: Simplify right side
    20,982.13x = 224,482,766.68
  5. Step 5: Solve for x
    x = 224,482,766.68/20,982.13
  6. Step 6: Final answer
    x = 10,698.76

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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.