Home / 20,850.31-31,279.57-7,702.80

Finding the Fourth Proportional to 20,850.31, 31,279.57 and 7,702.80

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Solution

The fourth proportional to 20,850.31, 31,279.57 and 7,702.80 is: 11,555.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,850.31 : 31,279.57 = 7,702.80 : x
  2. Step 2: Convert to fraction form
    20,850.31/31,279.57 = 7,702.80/x
  3. Step 3: Cross multiply
    20,850.31x = 31,279.57 × 7,702.80
  4. Step 4: Simplify right side
    20,850.31x = 240,940,135.24
  5. Step 5: Solve for x
    x = 240,940,135.24/20,850.31
  6. Step 6: Final answer
    x = 11,555.71

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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.