Home / 20,812.10-28,720.80-11,380.66

Finding the Fourth Proportional to 20,812.10, 28,720.80 and 11,380.66

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Solution

The fourth proportional to 20,812.10, 28,720.80 and 11,380.66 is: 15,705.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,812.10 : 28,720.80 = 11,380.66 : x
  2. Step 2: Convert to fraction form
    20,812.10/28,720.80 = 11,380.66/x
  3. Step 3: Cross multiply
    20,812.10x = 28,720.80 × 11,380.66
  4. Step 4: Simplify right side
    20,812.10x = 326,861,659.73
  5. Step 5: Solve for x
    x = 326,861,659.73/20,812.10
  6. Step 6: Final answer
    x = 15,705.37

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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.