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Finding the Fourth Proportional to 311.64, 429.57 and 290.97

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Solution

The fourth proportional to 311.64, 429.57 and 290.97 is: 401.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.64 : 429.57 = 290.97 : x
  2. Step 2: Convert to fraction form
    311.64/429.57 = 290.97/x
  3. Step 3: Cross multiply
    311.64x = 429.57 × 290.97
  4. Step 4: Simplify right side
    311.64x = 124,991.98
  5. Step 5: Solve for x
    x = 124,991.98/311.64
  6. Step 6: Final answer
    x = 401.08

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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.