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Finding the Fourth Proportional to 21,957.52, 32,940.30 and 8,811.20

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Solution

The fourth proportional to 21,957.52, 32,940.30 and 8,811.20 is: 13,218.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,957.52 : 32,940.30 = 8,811.20 : x
  2. Step 2: Convert to fraction form
    21,957.52/32,940.30 = 8,811.20/x
  3. Step 3: Cross multiply
    21,957.52x = 32,940.30 × 8,811.20
  4. Step 4: Simplify right side
    21,957.52x = 290,243,571.36
  5. Step 5: Solve for x
    x = 290,243,571.36/21,957.52
  6. Step 6: Final answer
    x = 13,218.41

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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.