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Finding the Fourth Proportional to 349.20, 523.20 and 211.76

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Solution

The fourth proportional to 349.20, 523.20 and 211.76 is: 317.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    349.20 : 523.20 = 211.76 : x
  2. Step 2: Convert to fraction form
    349.20/523.20 = 211.76/x
  3. Step 3: Cross multiply
    349.20x = 523.20 × 211.76
  4. Step 4: Simplify right side
    349.20x = 110,792.83
  5. Step 5: Solve for x
    x = 110,792.83/349.20
  6. Step 6: Final answer
    x = 317.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.