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Finding the Fourth Proportional to 291.25, 401.89 and 166.91

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Solution

The fourth proportional to 291.25, 401.89 and 166.91 is: 230.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.25 : 401.89 = 166.91 : x
  2. Step 2: Convert to fraction form
    291.25/401.89 = 166.91/x
  3. Step 3: Cross multiply
    291.25x = 401.89 × 166.91
  4. Step 4: Simplify right side
    291.25x = 67,077.45
  5. Step 5: Solve for x
    x = 67,077.45/291.25
  6. Step 6: Final answer
    x = 230.31

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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.