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Finding the Fourth Proportional to 1,223.30, 1,687.82 and 699.32

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Solution

The fourth proportional to 1,223.30, 1,687.82 and 699.32 is: 964.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.30 : 1,687.82 = 699.32 : x
  2. Step 2: Convert to fraction form
    1,223.30/1,687.82 = 699.32/x
  3. Step 3: Cross multiply
    1,223.30x = 1,687.82 × 699.32
  4. Step 4: Simplify right side
    1,223.30x = 1,180,326.28
  5. Step 5: Solve for x
    x = 1,180,326.28/1,223.30
  6. Step 6: Final answer
    x = 964.87

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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.