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Finding the Fourth Proportional to 251.19, 378.29 and 212.92

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Solution

The fourth proportional to 251.19, 378.29 and 212.92 is: 320.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.19 : 378.29 = 212.92 : x
  2. Step 2: Convert to fraction form
    251.19/378.29 = 212.92/x
  3. Step 3: Cross multiply
    251.19x = 378.29 × 212.92
  4. Step 4: Simplify right side
    251.19x = 80,545.09
  5. Step 5: Solve for x
    x = 80,545.09/251.19
  6. Step 6: Final answer
    x = 320.65

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.