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Finding the Fourth Proportional to 787.81, 1,181.34 and 239.87

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Solution

The fourth proportional to 787.81, 1,181.34 and 239.87 is: 359.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.81 : 1,181.34 = 239.87 : x
  2. Step 2: Convert to fraction form
    787.81/1,181.34 = 239.87/x
  3. Step 3: Cross multiply
    787.81x = 1,181.34 × 239.87
  4. Step 4: Simplify right side
    787.81x = 283,368.03
  5. Step 5: Solve for x
    x = 283,368.03/787.81
  6. Step 6: Final answer
    x = 359.69

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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.