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Finding the Fourth Proportional to 787.72, 1,181.12 and 239.76

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Solution

The fourth proportional to 787.72, 1,181.12 and 239.76 is: 359.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.72 : 1,181.12 = 239.76 : x
  2. Step 2: Convert to fraction form
    787.72/1,181.12 = 239.76/x
  3. Step 3: Cross multiply
    787.72x = 1,181.12 × 239.76
  4. Step 4: Simplify right side
    787.72x = 283,185.33
  5. Step 5: Solve for x
    x = 283,185.33/787.72
  6. Step 6: Final answer
    x = 359.50

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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.