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Finding the Fourth Proportional to 21,720.75, 32,581.49 and 8,573.01

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Solution

The fourth proportional to 21,720.75, 32,581.49 and 8,573.01 is: 12,859.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,720.75 : 32,581.49 = 8,573.01 : x
  2. Step 2: Convert to fraction form
    21,720.75/32,581.49 = 8,573.01/x
  3. Step 3: Cross multiply
    21,720.75x = 32,581.49 × 8,573.01
  4. Step 4: Simplify right side
    21,720.75x = 279,321,396.72
  5. Step 5: Solve for x
    x = 279,321,396.72/21,720.75
  6. Step 6: Final answer
    x = 12,859.66

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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.