Home / 20,872.44-31,311.90-9,780.12

Finding the Fourth Proportional to 20,872.44, 31,311.90 and 9,780.12

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Solution

The fourth proportional to 20,872.44, 31,311.90 and 9,780.12 is: 14,671.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.44 : 31,311.90 = 9,780.12 : x
  2. Step 2: Convert to fraction form
    20,872.44/31,311.90 = 9,780.12/x
  3. Step 3: Cross multiply
    20,872.44x = 31,311.90 × 9,780.12
  4. Step 4: Simplify right side
    20,872.44x = 306,234,139.43
  5. Step 5: Solve for x
    x = 306,234,139.43/20,872.44
  6. Step 6: Final answer
    x = 14,671.70

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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.