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Finding the Fourth Proportional to 268.11, 401.85 and 113.80

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Solution

The fourth proportional to 268.11, 401.85 and 113.80 is: 170.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.11 : 401.85 = 113.80 : x
  2. Step 2: Convert to fraction form
    268.11/401.85 = 113.80/x
  3. Step 3: Cross multiply
    268.11x = 401.85 × 113.80
  4. Step 4: Simplify right side
    268.11x = 45,730.53
  5. Step 5: Solve for x
    x = 45,730.53/268.11
  6. Step 6: Final answer
    x = 170.57

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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.