Home / 20,729.85-31,107.60-10,876.20

Finding the Fourth Proportional to 20,729.85, 31,107.60 and 10,876.20

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Solution

The fourth proportional to 20,729.85, 31,107.60 and 10,876.20 is: 16,321.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,729.85 : 31,107.60 = 10,876.20 : x
  2. Step 2: Convert to fraction form
    20,729.85/31,107.60 = 10,876.20/x
  3. Step 3: Cross multiply
    20,729.85x = 31,107.60 × 10,876.20
  4. Step 4: Simplify right side
    20,729.85x = 338,332,479.12
  5. Step 5: Solve for x
    x = 338,332,479.12/20,729.85
  6. Step 6: Final answer
    x = 16,321.03

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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.