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Finding the Fourth Proportional to 252.81, 378 and 214.74

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Solution

The fourth proportional to 252.81, 378 and 214.74 is: 321.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.81 : 378 = 214.74 : x
  2. Step 2: Convert to fraction form
    252.81/378 = 214.74/x
  3. Step 3: Cross multiply
    252.81x = 378 × 214.74
  4. Step 4: Simplify right side
    252.81x = 81,171.72
  5. Step 5: Solve for x
    x = 81,171.72/252.81
  6. Step 6: Final answer
    x = 321.08

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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.