Home / 20,728.09-28,609.37-13,172.94

Finding the Fourth Proportional to 20,728.09, 28,609.37 and 13,172.94

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Solution

The fourth proportional to 20,728.09, 28,609.37 and 13,172.94 is: 18,181.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,728.09 : 28,609.37 = 13,172.94 : x
  2. Step 2: Convert to fraction form
    20,728.09/28,609.37 = 13,172.94/x
  3. Step 3: Cross multiply
    20,728.09x = 28,609.37 × 13,172.94
  4. Step 4: Simplify right side
    20,728.09x = 376,869,514.45
  5. Step 5: Solve for x
    x = 376,869,514.45/20,728.09
  6. Step 6: Final answer
    x = 18,181.58

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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.