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Finding the Fourth Proportional to 1,223.31, 1,687.88 and 699.21

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Solution

The fourth proportional to 1,223.31, 1,687.88 and 699.21 is: 964.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.31 : 1,687.88 = 699.21 : x
  2. Step 2: Convert to fraction form
    1,223.31/1,687.88 = 699.21/x
  3. Step 3: Cross multiply
    1,223.31x = 1,687.88 × 699.21
  4. Step 4: Simplify right side
    1,223.31x = 1,180,179.08
  5. Step 5: Solve for x
    x = 1,180,179.08/1,223.31
  6. Step 6: Final answer
    x = 964.74

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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.