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Finding the Fourth Proportional to 787.72, 1,181.60 and 239.86

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Solution

The fourth proportional to 787.72, 1,181.60 and 239.86 is: 359.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.72 : 1,181.60 = 239.86 : x
  2. Step 2: Convert to fraction form
    787.72/1,181.60 = 239.86/x
  3. Step 3: Cross multiply
    787.72x = 1,181.60 × 239.86
  4. Step 4: Simplify right side
    787.72x = 283,418.58
  5. Step 5: Solve for x
    x = 283,418.58/787.72
  6. Step 6: Final answer
    x = 359.80

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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.