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Finding the Fourth Proportional to 21,806.62, 32,720.73 and 8,658.70

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Solution

The fourth proportional to 21,806.62, 32,720.73 and 8,658.70 is: 12,992.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,806.62 : 32,720.73 = 8,658.70 : x
  2. Step 2: Convert to fraction form
    21,806.62/32,720.73 = 8,658.70/x
  3. Step 3: Cross multiply
    21,806.62x = 32,720.73 × 8,658.70
  4. Step 4: Simplify right side
    21,806.62x = 283,318,984.85
  5. Step 5: Solve for x
    x = 283,318,984.85/21,806.62
  6. Step 6: Final answer
    x = 12,992.34

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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.