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Finding the Fourth Proportional to 343.20, 514.10 and 212.80

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Solution

The fourth proportional to 343.20, 514.10 and 212.80 is: 318.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    343.20 : 514.10 = 212.80 : x
  2. Step 2: Convert to fraction form
    343.20/514.10 = 212.80/x
  3. Step 3: Cross multiply
    343.20x = 514.10 × 212.80
  4. Step 4: Simplify right side
    343.20x = 109,400.48
  5. Step 5: Solve for x
    x = 109,400.48/343.20
  6. Step 6: Final answer
    x = 318.77

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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.