Home / 15,787.58-21,786.20-8,713.90

Finding the Fourth Proportional to 15,787.58, 21,786.20 and 8,713.90

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Solution

The fourth proportional to 15,787.58, 21,786.20 and 8,713.90 is: 12,024.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,787.58 : 21,786.20 = 8,713.90 : x
  2. Step 2: Convert to fraction form
    15,787.58/21,786.20 = 8,713.90/x
  3. Step 3: Cross multiply
    15,787.58x = 21,786.20 × 8,713.90
  4. Step 4: Simplify right side
    15,787.58x = 189,842,768.18
  5. Step 5: Solve for x
    x = 189,842,768.18/15,787.58
  6. Step 6: Final answer
    x = 12,024.82

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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.