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Finding the Fourth Proportional to 18,609.85, 27,921.44 and 7,941.61

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Solution

The fourth proportional to 18,609.85, 27,921.44 and 7,941.61 is: 11,915.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,609.85 : 27,921.44 = 7,941.61 : x
  2. Step 2: Convert to fraction form
    18,609.85/27,921.44 = 7,941.61/x
  3. Step 3: Cross multiply
    18,609.85x = 27,921.44 × 7,941.61
  4. Step 4: Simplify right side
    18,609.85x = 221,741,147.41
  5. Step 5: Solve for x
    x = 221,741,147.41/18,609.85
  6. Step 6: Final answer
    x = 11,915.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.