Home / 20,823.12-28,736.59-11,391.69

Finding the Fourth Proportional to 20,823.12, 28,736.59 and 11,391.69

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Solution

The fourth proportional to 20,823.12, 28,736.59 and 11,391.69 is: 15,720.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,823.12 : 28,736.59 = 11,391.69 : x
  2. Step 2: Convert to fraction form
    20,823.12/28,736.59 = 11,391.69/x
  3. Step 3: Cross multiply
    20,823.12x = 28,736.59 × 11,391.69
  4. Step 4: Simplify right side
    20,823.12x = 327,358,188.70
  5. Step 5: Solve for x
    x = 327,358,188.70/20,823.12
  6. Step 6: Final answer
    x = 15,720.90

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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.