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Finding the Fourth Proportional to 1,915.38, 2,874.05 and 819.45

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Solution

The fourth proportional to 1,915.38, 2,874.05 and 819.45 is: 1,229.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,915.38 : 2,874.05 = 819.45 : x
  2. Step 2: Convert to fraction form
    1,915.38/2,874.05 = 819.45/x
  3. Step 3: Cross multiply
    1,915.38x = 2,874.05 × 819.45
  4. Step 4: Simplify right side
    1,915.38x = 2,355,136.18
  5. Step 5: Solve for x
    x = 2,355,136.18/1,915.38
  6. Step 6: Final answer
    x = 1,229.59

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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.