Home / 20,819.56-28,720.92-12,319.36

Finding the Fourth Proportional to 20,819.56, 28,720.92 and 12,319.36

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Solution

The fourth proportional to 20,819.56, 28,720.92 and 12,319.36 is: 16,994.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,819.56 : 28,720.92 = 12,319.36 : x
  2. Step 2: Convert to fraction form
    20,819.56/28,720.92 = 12,319.36/x
  3. Step 3: Cross multiply
    20,819.56x = 28,720.92 × 12,319.36
  4. Step 4: Simplify right side
    20,819.56x = 353,823,353.01
  5. Step 5: Solve for x
    x = 353,823,353.01/20,819.56
  6. Step 6: Final answer
    x = 16,994.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.