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Finding the Fourth Proportional to 21,912.78, 30,241.76 and 12,963.16

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Solution

The fourth proportional to 21,912.78, 30,241.76 and 12,963.16 is: 17,890.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,912.78 : 30,241.76 = 12,963.16 : x
  2. Step 2: Convert to fraction form
    21,912.78/30,241.76 = 12,963.16/x
  3. Step 3: Cross multiply
    21,912.78x = 30,241.76 × 12,963.16
  4. Step 4: Simplify right side
    21,912.78x = 392,028,843.77
  5. Step 5: Solve for x
    x = 392,028,843.77/21,912.78
  6. Step 6: Final answer
    x = 17,890.42

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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.