Home / 20,839.78-28,758.90-11,408.32

Finding the Fourth Proportional to 20,839.78, 28,758.90 and 11,408.32

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Solution

The fourth proportional to 20,839.78, 28,758.90 and 11,408.32 is: 15,743.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,839.78 : 28,758.90 = 11,408.32 : x
  2. Step 2: Convert to fraction form
    20,839.78/28,758.90 = 11,408.32/x
  3. Step 3: Cross multiply
    20,839.78x = 28,758.90 × 11,408.32
  4. Step 4: Simplify right side
    20,839.78x = 328,090,734.05
  5. Step 5: Solve for x
    x = 328,090,734.05/20,839.78
  6. Step 6: Final answer
    x = 15,743.48

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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.