Home / 20,821.35-28,735.44-11,391.33

Finding the Fourth Proportional to 20,821.35, 28,735.44 and 11,391.33

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Solution

The fourth proportional to 20,821.35, 28,735.44 and 11,391.33 is: 15,721.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.35 : 28,735.44 = 11,391.33 : x
  2. Step 2: Convert to fraction form
    20,821.35/28,735.44 = 11,391.33/x
  3. Step 3: Cross multiply
    20,821.35x = 28,735.44 × 11,391.33
  4. Step 4: Simplify right side
    20,821.35x = 327,334,679.10
  5. Step 5: Solve for x
    x = 327,334,679.10/20,821.35
  6. Step 6: Final answer
    x = 15,721.11

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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.