Home / 20,812.26-28,720.90-11,380.88

Finding the Fourth Proportional to 20,812.26, 28,720.90 and 11,380.88

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Solution

The fourth proportional to 20,812.26, 28,720.90 and 11,380.88 is: 15,705.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,812.26 : 28,720.90 = 11,380.88 : x
  2. Step 2: Convert to fraction form
    20,812.26/28,720.90 = 11,380.88/x
  3. Step 3: Cross multiply
    20,812.26x = 28,720.90 × 11,380.88
  4. Step 4: Simplify right side
    20,812.26x = 326,869,116.39
  5. Step 5: Solve for x
    x = 326,869,116.39/20,812.26
  6. Step 6: Final answer
    x = 15,705.60

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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.