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Finding the Fourth Proportional to 787.67, 1,181.42 and 210.59

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Solution

The fourth proportional to 787.67, 1,181.42 and 210.59 is: 315.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.67 : 1,181.42 = 210.59 : x
  2. Step 2: Convert to fraction form
    787.67/1,181.42 = 210.59/x
  3. Step 3: Cross multiply
    787.67x = 1,181.42 × 210.59
  4. Step 4: Simplify right side
    787.67x = 248,794.18
  5. Step 5: Solve for x
    x = 248,794.18/787.67
  6. Step 6: Final answer
    x = 315.86

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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.