Home / 20,830.19-28,745.66-11,398.75

Finding the Fourth Proportional to 20,830.19, 28,745.66 and 11,398.75

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Solution

The fourth proportional to 20,830.19, 28,745.66 and 11,398.75 is: 15,730.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,830.19 : 28,745.66 = 11,398.75 : x
  2. Step 2: Convert to fraction form
    20,830.19/28,745.66 = 11,398.75/x
  3. Step 3: Cross multiply
    20,830.19x = 28,745.66 × 11,398.75
  4. Step 4: Simplify right side
    20,830.19x = 327,664,591.93
  5. Step 5: Solve for x
    x = 327,664,591.93/20,830.19
  6. Step 6: Final answer
    x = 15,730.27

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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.