Home / 20,811.67-28,720.11-11,380.23

Finding the Fourth Proportional to 20,811.67, 28,720.11 and 11,380.23

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Solution

The fourth proportional to 20,811.67, 28,720.11 and 11,380.23 is: 15,704.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.67 : 28,720.11 = 11,380.23 : x
  2. Step 2: Convert to fraction form
    20,811.67/28,720.11 = 11,380.23/x
  3. Step 3: Cross multiply
    20,811.67x = 28,720.11 × 11,380.23
  4. Step 4: Simplify right side
    20,811.67x = 326,841,457.43
  5. Step 5: Solve for x
    x = 326,841,457.43/20,811.67
  6. Step 6: Final answer
    x = 15,704.72

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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.