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Finding the Fourth Proportional to 1,915.26, 2,872.94 and 682.79

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Solution

The fourth proportional to 1,915.26, 2,872.94 and 682.79 is: 1,024.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,915.26 : 2,872.94 = 682.79 : x
  2. Step 2: Convert to fraction form
    1,915.26/2,872.94 = 682.79/x
  3. Step 3: Cross multiply
    1,915.26x = 2,872.94 × 682.79
  4. Step 4: Simplify right side
    1,915.26x = 1,961,596.92
  5. Step 5: Solve for x
    x = 1,961,596.92/1,915.26
  6. Step 6: Final answer
    x = 1,024.19

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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.