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Finding the Fourth Proportional to 290.76, 401.28 and 166.42

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Solution

The fourth proportional to 290.76, 401.28 and 166.42 is: 229.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.76 : 401.28 = 166.42 : x
  2. Step 2: Convert to fraction form
    290.76/401.28 = 166.42/x
  3. Step 3: Cross multiply
    290.76x = 401.28 × 166.42
  4. Step 4: Simplify right side
    290.76x = 66,781.02
  5. Step 5: Solve for x
    x = 66,781.02/290.76
  6. Step 6: Final answer
    x = 229.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.