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Finding the Fourth Proportional to 291.12, 401.70 and 166.72

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Solution

The fourth proportional to 291.12, 401.70 and 166.72 is: 230.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.12 : 401.70 = 166.72 : x
  2. Step 2: Convert to fraction form
    291.12/401.70 = 166.72/x
  3. Step 3: Cross multiply
    291.12x = 401.70 × 166.72
  4. Step 4: Simplify right side
    291.12x = 66,971.42
  5. Step 5: Solve for x
    x = 66,971.42/291.12
  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.