Home / 20,380.86-28,121.31-13,317.66

Finding the Fourth Proportional to 20,380.86, 28,121.31 and 13,317.66

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Solution

The fourth proportional to 20,380.86, 28,121.31 and 13,317.66 is: 18,375.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,380.86 : 28,121.31 = 13,317.66 : x
  2. Step 2: Convert to fraction form
    20,380.86/28,121.31 = 13,317.66/x
  3. Step 3: Cross multiply
    20,380.86x = 28,121.31 × 13,317.66
  4. Step 4: Simplify right side
    20,380.86x = 374,510,045.33
  5. Step 5: Solve for x
    x = 374,510,045.33/20,380.86
  6. Step 6: Final answer
    x = 18,375.58

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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.