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Finding the Fourth Proportional to 131.82, 198.09 and 74.13

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Solution

The fourth proportional to 131.82, 198.09 and 74.13 is: 111.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.82 : 198.09 = 74.13 : x
  2. Step 2: Convert to fraction form
    131.82/198.09 = 74.13/x
  3. Step 3: Cross multiply
    131.82x = 198.09 × 74.13
  4. Step 4: Simplify right side
    131.82x = 14,684.41
  5. Step 5: Solve for x
    x = 14,684.41/131.82
  6. Step 6: Final answer
    x = 111.40

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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.