Home / 20,830.72-28,745.82-11,399.08

Finding the Fourth Proportional to 20,830.72, 28,745.82 and 11,399.08

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Solution

The fourth proportional to 20,830.72, 28,745.82 and 11,399.08 is: 15,730.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,830.72 : 28,745.82 = 11,399.08 : x
  2. Step 2: Convert to fraction form
    20,830.72/28,745.82 = 11,399.08/x
  3. Step 3: Cross multiply
    20,830.72x = 28,745.82 × 11,399.08
  4. Step 4: Simplify right side
    20,830.72x = 327,675,901.85
  5. Step 5: Solve for x
    x = 327,675,901.85/20,830.72
  6. Step 6: Final answer
    x = 15,730.42

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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.