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Finding the Fourth Proportional to 787.97, 1,181.77 and 355.25

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Solution

The fourth proportional to 787.97, 1,181.77 and 355.25 is: 532.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.97 : 1,181.77 = 355.25 : x
  2. Step 2: Convert to fraction form
    787.97/1,181.77 = 355.25/x
  3. Step 3: Cross multiply
    787.97x = 1,181.77 × 355.25
  4. Step 4: Simplify right side
    787.97x = 419,823.79
  5. Step 5: Solve for x
    x = 419,823.79/787.97
  6. Step 6: Final answer
    x = 532.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.