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Finding the Fourth Proportional to 1,222.97, 1,687.67 and 698.97

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Solution

The fourth proportional to 1,222.97, 1,687.67 and 698.97 is: 964.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.97 : 1,687.67 = 698.97 : x
  2. Step 2: Convert to fraction form
    1,222.97/1,687.67 = 698.97/x
  3. Step 3: Cross multiply
    1,222.97x = 1,687.67 × 698.97
  4. Step 4: Simplify right side
    1,222.97x = 1,179,630.70
  5. Step 5: Solve for x
    x = 1,179,630.70/1,222.97
  6. Step 6: Final answer
    x = 964.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.