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Finding the Fourth Proportional to 15,211.78, 20,990.19 and 8,496.57

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Solution

The fourth proportional to 15,211.78, 20,990.19 and 8,496.57 is: 11,724.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,211.78 : 20,990.19 = 8,496.57 : x
  2. Step 2: Convert to fraction form
    15,211.78/20,990.19 = 8,496.57/x
  3. Step 3: Cross multiply
    15,211.78x = 20,990.19 × 8,496.57
  4. Step 4: Simplify right side
    15,211.78x = 178,344,618.65
  5. Step 5: Solve for x
    x = 178,344,618.65/15,211.78
  6. Step 6: Final answer
    x = 11,724.11

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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.