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Finding the Fourth Proportional to 787.69, 1,181.72 and 354.61

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Solution

The fourth proportional to 787.69, 1,181.72 and 354.61 is: 532.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.69 : 1,181.72 = 354.61 : x
  2. Step 2: Convert to fraction form
    787.69/1,181.72 = 354.61/x
  3. Step 3: Cross multiply
    787.69x = 1,181.72 × 354.61
  4. Step 4: Simplify right side
    787.69x = 419,049.73
  5. Step 5: Solve for x
    x = 419,049.73/787.69
  6. Step 6: Final answer
    x = 532.00

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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.