Home / 20,845.97-28,771.90-13,290.56

Finding the Fourth Proportional to 20,845.97, 28,771.90 and 13,290.56

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Solution

The fourth proportional to 20,845.97, 28,771.90 and 13,290.56 is: 18,343.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,845.97 : 28,771.90 = 13,290.56 : x
  2. Step 2: Convert to fraction form
    20,845.97/28,771.90 = 13,290.56/x
  3. Step 3: Cross multiply
    20,845.97x = 28,771.90 × 13,290.56
  4. Step 4: Simplify right side
    20,845.97x = 382,394,486.18
  5. Step 5: Solve for x
    x = 382,394,486.18/20,845.97
  6. Step 6: Final answer
    x = 18,343.81

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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.