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Finding the Fourth Proportional to 1,276.38, 1,912.95 and 698.58

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Solution

The fourth proportional to 1,276.38, 1,912.95 and 698.58 is: 1,046.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.38 : 1,912.95 = 698.58 : x
  2. Step 2: Convert to fraction form
    1,276.38/1,912.95 = 698.58/x
  3. Step 3: Cross multiply
    1,276.38x = 1,912.95 × 698.58
  4. Step 4: Simplify right side
    1,276.38x = 1,336,348.61
  5. Step 5: Solve for x
    x = 1,336,348.61/1,276.38
  6. Step 6: Final answer
    x = 1,046.98

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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.