Home / 20,829.78-28,745.19-11,398.32

Finding the Fourth Proportional to 20,829.78, 28,745.19 and 11,398.32

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Solution

The fourth proportional to 20,829.78, 28,745.19 and 11,398.32 is: 15,729.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,829.78 : 28,745.19 = 11,398.32 : x
  2. Step 2: Convert to fraction form
    20,829.78/28,745.19 = 11,398.32/x
  3. Step 3: Cross multiply
    20,829.78x = 28,745.19 × 11,398.32
  4. Step 4: Simplify right side
    20,829.78x = 327,646,874.08
  5. Step 5: Solve for x
    x = 327,646,874.08/20,829.78
  6. Step 6: Final answer
    x = 15,729.73

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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.