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Finding the Fourth Proportional to 21,957.88, 32,940.98 and 8,811.29

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Solution

The fourth proportional to 21,957.88, 32,940.98 and 8,811.29 is: 13,218.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,957.88 : 32,940.98 = 8,811.29 : x
  2. Step 2: Convert to fraction form
    21,957.88/32,940.98 = 8,811.29/x
  3. Step 3: Cross multiply
    21,957.88x = 32,940.98 × 8,811.29
  4. Step 4: Simplify right side
    21,957.88x = 290,252,318.90
  5. Step 5: Solve for x
    x = 290,252,318.90/21,957.88
  6. Step 6: Final answer
    x = 13,218.60

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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.