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Finding the Fourth Proportional to 1,276.78, 1,915.72 and 698.98

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Solution

The fourth proportional to 1,276.78, 1,915.72 and 698.98 is: 1,048.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.78 : 1,915.72 = 698.98 : x
  2. Step 2: Convert to fraction form
    1,276.78/1,915.72 = 698.98/x
  3. Step 3: Cross multiply
    1,276.78x = 1,915.72 × 698.98
  4. Step 4: Simplify right side
    1,276.78x = 1,339,049.97
  5. Step 5: Solve for x
    x = 1,339,049.97/1,276.78
  6. Step 6: Final answer
    x = 1,048.77

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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.