Home / 20,876.85-31,315.20-5,081.70

Finding the Fourth Proportional to 20,876.85, 31,315.20 and 5,081.70

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Solution

The fourth proportional to 20,876.85, 31,315.20 and 5,081.70 is: 7,622.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,876.85 : 31,315.20 = 5,081.70 : x
  2. Step 2: Convert to fraction form
    20,876.85/31,315.20 = 5,081.70/x
  3. Step 3: Cross multiply
    20,876.85x = 31,315.20 × 5,081.70
  4. Step 4: Simplify right side
    20,876.85x = 159,134,451.84
  5. Step 5: Solve for x
    x = 159,134,451.84/20,876.85
  6. Step 6: Final answer
    x = 7,622.53

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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.