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Finding the Fourth Proportional to 1,223.14, 1,687.94 and 663.61

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Solution

The fourth proportional to 1,223.14, 1,687.94 and 663.61 is: 915.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.14 : 1,687.94 = 663.61 : x
  2. Step 2: Convert to fraction form
    1,223.14/1,687.94 = 663.61/x
  3. Step 3: Cross multiply
    1,223.14x = 1,687.94 × 663.61
  4. Step 4: Simplify right side
    1,223.14x = 1,120,126.33
  5. Step 5: Solve for x
    x = 1,120,126.33/1,223.14
  6. Step 6: Final answer
    x = 915.78

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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.