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Finding the Fourth Proportional to 345.20, 517.10 and 214.80

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Solution

The fourth proportional to 345.20, 517.10 and 214.80 is: 321.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.20 : 517.10 = 214.80 : x
  2. Step 2: Convert to fraction form
    345.20/517.10 = 214.80/x
  3. Step 3: Cross multiply
    345.20x = 517.10 × 214.80
  4. Step 4: Simplify right side
    345.20x = 111,073.08
  5. Step 5: Solve for x
    x = 111,073.08/345.20
  6. Step 6: Final answer
    x = 321.76

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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.