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Finding the Fourth Proportional to 787.73, 1,086.89 and 438.41

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Solution

The fourth proportional to 787.73, 1,086.89 and 438.41 is: 604.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.73 : 1,086.89 = 438.41 : x
  2. Step 2: Convert to fraction form
    787.73/1,086.89 = 438.41/x
  3. Step 3: Cross multiply
    787.73x = 1,086.89 × 438.41
  4. Step 4: Simplify right side
    787.73x = 476,503.97
  5. Step 5: Solve for x
    x = 476,503.97/787.73
  6. Step 6: Final answer
    x = 604.91

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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.