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Finding the Fourth Proportional to 343.43, 473.79 and 212.21

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Solution

The fourth proportional to 343.43, 473.79 and 212.21 is: 292.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    343.43 : 473.79 = 212.21 : x
  2. Step 2: Convert to fraction form
    343.43/473.79 = 212.21/x
  3. Step 3: Cross multiply
    343.43x = 473.79 × 212.21
  4. Step 4: Simplify right side
    343.43x = 100,541.14
  5. Step 5: Solve for x
    x = 100,541.14/343.43
  6. Step 6: Final answer
    x = 292.76

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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.