Home / 20,911.72-28,858.22-11,480.89

Finding the Fourth Proportional to 20,911.72, 28,858.22 and 11,480.89

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Solution

The fourth proportional to 20,911.72, 28,858.22 and 11,480.89 is: 15,843.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,911.72 : 28,858.22 = 11,480.89 : x
  2. Step 2: Convert to fraction form
    20,911.72/28,858.22 = 11,480.89/x
  3. Step 3: Cross multiply
    20,911.72x = 28,858.22 × 11,480.89
  4. Step 4: Simplify right side
    20,911.72x = 331,317,962.92
  5. Step 5: Solve for x
    x = 331,317,962.92/20,911.72
  6. Step 6: Final answer
    x = 15,843.65

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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.