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Finding the Fourth Proportional to 21,939.60, 32,899.80 and 8,787.60

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Solution

The fourth proportional to 21,939.60, 32,899.80 and 8,787.60 is: 13,177.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,939.60 : 32,899.80 = 8,787.60 : x
  2. Step 2: Convert to fraction form
    21,939.60/32,899.80 = 8,787.60/x
  3. Step 3: Cross multiply
    21,939.60x = 32,899.80 × 8,787.60
  4. Step 4: Simplify right side
    21,939.60x = 289,110,282.48
  5. Step 5: Solve for x
    x = 289,110,282.48/21,939.60
  6. Step 6: Final answer
    x = 13,177.55

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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.