Home / 20,728.23-28,609.57-13,173.09

Finding the Fourth Proportional to 20,728.23, 28,609.57 and 13,173.09

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Solution

The fourth proportional to 20,728.23, 28,609.57 and 13,173.09 is: 18,181.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,728.23 : 28,609.57 = 13,173.09 : x
  2. Step 2: Convert to fraction form
    20,728.23/28,609.57 = 13,173.09/x
  3. Step 3: Cross multiply
    20,728.23x = 28,609.57 × 13,173.09
  4. Step 4: Simplify right side
    20,728.23x = 376,876,297.42
  5. Step 5: Solve for x
    x = 376,876,297.42/20,728.23
  6. Step 6: Final answer
    x = 18,181.79

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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.