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Finding the Fourth Proportional to 394.71, 592.14 and 212.31

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Solution

The fourth proportional to 394.71, 592.14 and 212.31 is: 318.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.71 : 592.14 = 212.31 : x
  2. Step 2: Convert to fraction form
    394.71/592.14 = 212.31/x
  3. Step 3: Cross multiply
    394.71x = 592.14 × 212.31
  4. Step 4: Simplify right side
    394.71x = 125,717.24
  5. Step 5: Solve for x
    x = 125,717.24/394.71
  6. Step 6: Final answer
    x = 318.51

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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.