Home / 20,959.76-31,391.15-12,621.37

Finding the Fourth Proportional to 20,959.76, 31,391.15 and 12,621.37

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Solution

The fourth proportional to 20,959.76, 31,391.15 and 12,621.37 is: 18,902.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,959.76 : 31,391.15 = 12,621.37 : x
  2. Step 2: Convert to fraction form
    20,959.76/31,391.15 = 12,621.37/x
  3. Step 3: Cross multiply
    20,959.76x = 31,391.15 × 12,621.37
  4. Step 4: Simplify right side
    20,959.76x = 396,199,236.15
  5. Step 5: Solve for x
    x = 396,199,236.15/20,959.76
  6. Step 6: Final answer
    x = 18,902.85

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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.