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Finding the Fourth Proportional to 21,891.80, 32,851.20 and 8,742.80

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Solution

The fourth proportional to 21,891.80, 32,851.20 and 8,742.80 is: 13,119.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,891.80 : 32,851.20 = 8,742.80 : x
  2. Step 2: Convert to fraction form
    21,891.80/32,851.20 = 8,742.80/x
  3. Step 3: Cross multiply
    21,891.80x = 32,851.20 × 8,742.80
  4. Step 4: Simplify right side
    21,891.80x = 287,211,471.36
  5. Step 5: Solve for x
    x = 287,211,471.36/21,891.80
  6. Step 6: Final answer
    x = 13,119.59

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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.