Home / 20,729.20-31,093.80-6,878.20

Finding the Fourth Proportional to 20,729.20, 31,093.80 and 6,878.20

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Solution

The fourth proportional to 20,729.20, 31,093.80 and 6,878.20 is: 10,317.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,729.20 : 31,093.80 = 6,878.20 : x
  2. Step 2: Convert to fraction form
    20,729.20/31,093.80 = 6,878.20/x
  3. Step 3: Cross multiply
    20,729.20x = 31,093.80 × 6,878.20
  4. Step 4: Simplify right side
    20,729.20x = 213,869,375.16
  5. Step 5: Solve for x
    x = 213,869,375.16/20,729.20
  6. Step 6: Final answer
    x = 10,317.30

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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.