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Finding the Fourth Proportional to 20,595.20, 30,921.60 and 12,819.20

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Solution

The fourth proportional to 20,595.20, 30,921.60 and 12,819.20 is: 19,246.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,595.20 : 30,921.60 = 12,819.20 : x
  2. Step 2: Convert to fraction form
    20,595.20/30,921.60 = 12,819.20/x
  3. Step 3: Cross multiply
    20,595.20x = 30,921.60 × 12,819.20
  4. Step 4: Simplify right side
    20,595.20x = 396,390,174.72
  5. Step 5: Solve for x
    x = 396,390,174.72/20,595.20
  6. Step 6: Final answer
    x = 19,246.73

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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.