Home / 20,809.20-28,719.32-11,856.24

Finding the Fourth Proportional to 20,809.20, 28,719.32 and 11,856.24

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Solution

The fourth proportional to 20,809.20, 28,719.32 and 11,856.24 is: 16,363.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,809.20 : 28,719.32 = 11,856.24 : x
  2. Step 2: Convert to fraction form
    20,809.20/28,719.32 = 11,856.24/x
  3. Step 3: Cross multiply
    20,809.20x = 28,719.32 × 11,856.24
  4. Step 4: Simplify right side
    20,809.20x = 340,503,150.56
  5. Step 5: Solve for x
    x = 340,503,150.56/20,809.20
  6. Step 6: Final answer
    x = 16,363.11

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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.