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Finding the Fourth Proportional to 15,787.75, 21,786.99 and 8,714.02

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Solution

The fourth proportional to 15,787.75, 21,786.99 and 8,714.02 is: 12,025.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,787.75 : 21,786.99 = 8,714.02 : x
  2. Step 2: Convert to fraction form
    15,787.75/21,786.99 = 8,714.02/x
  3. Step 3: Cross multiply
    15,787.75x = 21,786.99 × 8,714.02
  4. Step 4: Simplify right side
    15,787.75x = 189,852,266.60
  5. Step 5: Solve for x
    x = 189,852,266.60/15,787.75
  6. Step 6: Final answer
    x = 12,025.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.