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Finding the Fourth Proportional to 39,793.55, 54,915.99 and 21,890.12

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Solution

The fourth proportional to 39,793.55, 54,915.99 and 21,890.12 is: 30,208.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,793.55 : 54,915.99 = 21,890.12 : x
  2. Step 2: Convert to fraction form
    39,793.55/54,915.99 = 21,890.12/x
  3. Step 3: Cross multiply
    39,793.55x = 54,915.99 × 21,890.12
  4. Step 4: Simplify right side
    39,793.55x = 1,202,117,611.02
  5. Step 5: Solve for x
    x = 1,202,117,611.02/39,793.55
  6. Step 6: Final answer
    x = 30,208.86

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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.