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Finding the Fourth Proportional to 291.09, 401.65 and 166.72

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Solution

The fourth proportional to 291.09, 401.65 and 166.72 is: 230.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.09 : 401.65 = 166.72 : x
  2. Step 2: Convert to fraction form
    291.09/401.65 = 166.72/x
  3. Step 3: Cross multiply
    291.09x = 401.65 × 166.72
  4. Step 4: Simplify right side
    291.09x = 66,965.15
  5. Step 5: Solve for x
    x = 66,965.15/291.09
  6. Step 6: Final answer
    x = 230.05

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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.