Home / 20,819.38-31,207.20-12,921.88

Finding the Fourth Proportional to 20,819.38, 31,207.20 and 12,921.88

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Solution

The fourth proportional to 20,819.38, 31,207.20 and 12,921.88 is: 19,369.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,819.38 : 31,207.20 = 12,921.88 : x
  2. Step 2: Convert to fraction form
    20,819.38/31,207.20 = 12,921.88/x
  3. Step 3: Cross multiply
    20,819.38x = 31,207.20 × 12,921.88
  4. Step 4: Simplify right side
    20,819.38x = 403,255,693.54
  5. Step 5: Solve for x
    x = 403,255,693.54/20,819.38
  6. Step 6: Final answer
    x = 19,369.25

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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.