Home / 20,411.85-28,169.10-11,919.41

Finding the Fourth Proportional to 20,411.85, 28,169.10 and 11,919.41

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Solution

The fourth proportional to 20,411.85, 28,169.10 and 11,919.41 is: 16,449.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,411.85 : 28,169.10 = 11,919.41 : x
  2. Step 2: Convert to fraction form
    20,411.85/28,169.10 = 11,919.41/x
  3. Step 3: Cross multiply
    20,411.85x = 28,169.10 × 11,919.41
  4. Step 4: Simplify right side
    20,411.85x = 335,759,052.23
  5. Step 5: Solve for x
    x = 335,759,052.23/20,411.85
  6. Step 6: Final answer
    x = 16,449.22

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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.