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Finding the Fourth Proportional to 787.26, 1,083.84 and 629.31

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Solution

The fourth proportional to 787.26, 1,083.84 and 629.31 is: 866.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.26 : 1,083.84 = 629.31 : x
  2. Step 2: Convert to fraction form
    787.26/1,083.84 = 629.31/x
  3. Step 3: Cross multiply
    787.26x = 1,083.84 × 629.31
  4. Step 4: Simplify right side
    787.26x = 682,071.35
  5. Step 5: Solve for x
    x = 682,071.35/787.26
  6. Step 6: Final answer
    x = 866.39

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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.