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Finding the Fourth Proportional to 1,223, 1,687.68 and 699.04

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Solution

The fourth proportional to 1,223, 1,687.68 and 699.04 is: 964.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223 : 1,687.68 = 699.04 : x
  2. Step 2: Convert to fraction form
    1,223/1,687.68 = 699.04/x
  3. Step 3: Cross multiply
    1,223x = 1,687.68 × 699.04
  4. Step 4: Simplify right side
    1,223x = 1,179,755.83
  5. Step 5: Solve for x
    x = 1,179,755.83/1,223
  6. Step 6: Final answer
    x = 964.64

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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.