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Finding the Fourth Proportional to 311.40, 429.53 and 213.30

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Solution

The fourth proportional to 311.40, 429.53 and 213.30 is: 294.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.40 : 429.53 = 213.30 : x
  2. Step 2: Convert to fraction form
    311.40/429.53 = 213.30/x
  3. Step 3: Cross multiply
    311.40x = 429.53 × 213.30
  4. Step 4: Simplify right side
    311.40x = 91,617.68
  5. Step 5: Solve for x
    x = 91,617.68/311.40
  6. Step 6: Final answer
    x = 294.21

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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.