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Finding the Fourth Proportional to 290.55, 400.96 and 166.21

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Solution

The fourth proportional to 290.55, 400.96 and 166.21 is: 229.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.55 : 400.96 = 166.21 : x
  2. Step 2: Convert to fraction form
    290.55/400.96 = 166.21/x
  3. Step 3: Cross multiply
    290.55x = 400.96 × 166.21
  4. Step 4: Simplify right side
    290.55x = 66,642.86
  5. Step 5: Solve for x
    x = 66,642.86/290.55
  6. Step 6: Final answer
    x = 229.37

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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.