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Finding the Fourth Proportional to 1,223.12, 1,687.91 and 677.41

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Solution

The fourth proportional to 1,223.12, 1,687.91 and 677.41 is: 934.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.12 : 1,687.91 = 677.41 : x
  2. Step 2: Convert to fraction form
    1,223.12/1,687.91 = 677.41/x
  3. Step 3: Cross multiply
    1,223.12x = 1,687.91 × 677.41
  4. Step 4: Simplify right side
    1,223.12x = 1,143,395.29
  5. Step 5: Solve for x
    x = 1,143,395.29/1,223.12
  6. Step 6: Final answer
    x = 934.82

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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.