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Finding the Fourth Proportional to 239.49, 330.21 and 214.92

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Solution

The fourth proportional to 239.49, 330.21 and 214.92 is: 296.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.49 : 330.21 = 214.92 : x
  2. Step 2: Convert to fraction form
    239.49/330.21 = 214.92/x
  3. Step 3: Cross multiply
    239.49x = 330.21 × 214.92
  4. Step 4: Simplify right side
    239.49x = 70,968.73
  5. Step 5: Solve for x
    x = 70,968.73/239.49
  6. Step 6: Final answer
    x = 296.33

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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.