Home / 2,639.78-3,961.05-1,915.34

Finding the Fourth Proportional to 2,639.78, 3,961.05 and 1,915.34

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Solution

The fourth proportional to 2,639.78, 3,961.05 and 1,915.34 is: 2,874.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,639.78 : 3,961.05 = 1,915.34 : x
  2. Step 2: Convert to fraction form
    2,639.78/3,961.05 = 1,915.34/x
  3. Step 3: Cross multiply
    2,639.78x = 3,961.05 × 1,915.34
  4. Step 4: Simplify right side
    2,639.78x = 7,586,737.70
  5. Step 5: Solve for x
    x = 7,586,737.70/2,639.78
  6. Step 6: Final answer
    x = 2,874.00

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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.