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Finding the Fourth Proportional to 308.14, 424.79 and 219.66

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Solution

The fourth proportional to 308.14, 424.79 and 219.66 is: 302.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.14 : 424.79 = 219.66 : x
  2. Step 2: Convert to fraction form
    308.14/424.79 = 219.66/x
  3. Step 3: Cross multiply
    308.14x = 424.79 × 219.66
  4. Step 4: Simplify right side
    308.14x = 93,311.13
  5. Step 5: Solve for x
    x = 93,311.13/308.14
  6. Step 6: Final answer
    x = 302.82

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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.