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Finding the Fourth Proportional to 667.31, 1,000.78 and 198.88

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Solution

The fourth proportional to 667.31, 1,000.78 and 198.88 is: 298.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.31 : 1,000.78 = 198.88 : x
  2. Step 2: Convert to fraction form
    667.31/1,000.78 = 198.88/x
  3. Step 3: Cross multiply
    667.31x = 1,000.78 × 198.88
  4. Step 4: Simplify right side
    667.31x = 199,035.50
  5. Step 5: Solve for x
    x = 199,035.50/667.31
  6. Step 6: Final answer
    x = 298.26

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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.