Home / 20,720.72-28,604.14-12,220.04

Finding the Fourth Proportional to 20,720.72, 28,604.14 and 12,220.04

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Solution

The fourth proportional to 20,720.72, 28,604.14 and 12,220.04 is: 16,869.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.72 : 28,604.14 = 12,220.04 : x
  2. Step 2: Convert to fraction form
    20,720.72/28,604.14 = 12,220.04/x
  3. Step 3: Cross multiply
    20,720.72x = 28,604.14 × 12,220.04
  4. Step 4: Simplify right side
    20,720.72x = 349,543,734.97
  5. Step 5: Solve for x
    x = 349,543,734.97/20,720.72
  6. Step 6: Final answer
    x = 16,869.29

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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.