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Finding the Fourth Proportional to 1,276.67, 1,915.59 and 757.70

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Solution

The fourth proportional to 1,276.67, 1,915.59 and 757.70 is: 1,136.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.67 : 1,915.59 = 757.70 : x
  2. Step 2: Convert to fraction form
    1,276.67/1,915.59 = 757.70/x
  3. Step 3: Cross multiply
    1,276.67x = 1,915.59 × 757.70
  4. Step 4: Simplify right side
    1,276.67x = 1,451,442.54
  5. Step 5: Solve for x
    x = 1,451,442.54/1,276.67
  6. Step 6: Final answer
    x = 1,136.90

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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.