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Finding the Fourth Proportional to 21,791.12, 32,690.28 and 8,643.56

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Solution

The fourth proportional to 21,791.12, 32,690.28 and 8,643.56 is: 12,966.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,791.12 : 32,690.28 = 8,643.56 : x
  2. Step 2: Convert to fraction form
    21,791.12/32,690.28 = 8,643.56/x
  3. Step 3: Cross multiply
    21,791.12x = 32,690.28 × 8,643.56
  4. Step 4: Simplify right side
    21,791.12x = 282,560,396.60
  5. Step 5: Solve for x
    x = 282,560,396.60/21,791.12
  6. Step 6: Final answer
    x = 12,966.77

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1.5x scale

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.