Home / 20,811.92-28,720.16-11,859.96

Finding the Fourth Proportional to 20,811.92, 28,720.16 and 11,859.96

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Solution

The fourth proportional to 20,811.92, 28,720.16 and 11,859.96 is: 16,366.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.92 : 28,720.16 = 11,859.96 : x
  2. Step 2: Convert to fraction form
    20,811.92/28,720.16 = 11,859.96/x
  3. Step 3: Cross multiply
    20,811.92x = 28,720.16 × 11,859.96
  4. Step 4: Simplify right side
    20,811.92x = 340,619,948.79
  5. Step 5: Solve for x
    x = 340,619,948.79/20,811.92
  6. Step 6: Final answer
    x = 16,366.58

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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.