Home / 7,981.25-11,977.20-2,787.12

Finding the Fourth Proportional to 7,981.25, 11,977.20 and 2,787.12

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Solution

The fourth proportional to 7,981.25, 11,977.20 and 2,787.12 is: 4,182.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,981.25 : 11,977.20 = 2,787.12 : x
  2. Step 2: Convert to fraction form
    7,981.25/11,977.20 = 2,787.12/x
  3. Step 3: Cross multiply
    7,981.25x = 11,977.20 × 2,787.12
  4. Step 4: Simplify right side
    7,981.25x = 33,381,893.66
  5. Step 5: Solve for x
    x = 33,381,893.66/7,981.25
  6. Step 6: Final answer
    x = 4,182.54

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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.