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Finding the Fourth Proportional to 198.31, 297.45 and 140.78

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Solution

The fourth proportional to 198.31, 297.45 and 140.78 is: 211.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.31 : 297.45 = 140.78 : x
  2. Step 2: Convert to fraction form
    198.31/297.45 = 140.78/x
  3. Step 3: Cross multiply
    198.31x = 297.45 × 140.78
  4. Step 4: Simplify right side
    198.31x = 41,875.01
  5. Step 5: Solve for x
    x = 41,875.01/198.31
  6. Step 6: Final answer
    x = 211.16

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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.