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Finding the Fourth Proportional to 15,209.46, 20,986.97 and 8,494.23

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Solution

The fourth proportional to 15,209.46, 20,986.97 and 8,494.23 is: 11,720.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,209.46 : 20,986.97 = 8,494.23 : x
  2. Step 2: Convert to fraction form
    15,209.46/20,986.97 = 8,494.23/x
  3. Step 3: Cross multiply
    15,209.46x = 20,986.97 × 8,494.23
  4. Step 4: Simplify right side
    15,209.46x = 178,268,258.08
  5. Step 5: Solve for x
    x = 178,268,258.08/15,209.46
  6. Step 6: Final answer
    x = 11,720.88

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Double scale
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Similar ratio
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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.