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Finding the Fourth Proportional to 1,276.72, 1,915.86 and 691.46

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Solution

The fourth proportional to 1,276.72, 1,915.86 and 691.46 is: 1,037.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.72 : 1,915.86 = 691.46 : x
  2. Step 2: Convert to fraction form
    1,276.72/1,915.86 = 691.46/x
  3. Step 3: Cross multiply
    1,276.72x = 1,915.86 × 691.46
  4. Step 4: Simplify right side
    1,276.72x = 1,324,740.56
  5. Step 5: Solve for x
    x = 1,324,740.56/1,276.72
  6. Step 6: Final answer
    x = 1,037.61

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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.