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Finding the Fourth Proportional to 1,276.85, 1,915.62 and 691.59

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Solution

The fourth proportional to 1,276.85, 1,915.62 and 691.59 is: 1,037.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.85 : 1,915.62 = 691.59 : x
  2. Step 2: Convert to fraction form
    1,276.85/1,915.62 = 691.59/x
  3. Step 3: Cross multiply
    1,276.85x = 1,915.62 × 691.59
  4. Step 4: Simplify right side
    1,276.85x = 1,324,824.97
  5. Step 5: Solve for x
    x = 1,324,824.97/1,276.85
  6. Step 6: Final answer
    x = 1,037.57

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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.