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Finding the Fourth Proportional to 21,912.75, 30,239.60 and 11,841.16

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Solution

The fourth proportional to 21,912.75, 30,239.60 and 11,841.16 is: 16,340.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,912.75 : 30,239.60 = 11,841.16 : x
  2. Step 2: Convert to fraction form
    21,912.75/30,239.60 = 11,841.16/x
  3. Step 3: Cross multiply
    21,912.75x = 30,239.60 × 11,841.16
  4. Step 4: Simplify right side
    21,912.75x = 358,072,048.79
  5. Step 5: Solve for x
    x = 358,072,048.79/21,912.75
  6. Step 6: Final answer
    x = 16,340.81

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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.