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Finding the Fourth Proportional to 248.55, 342.11 and 217.38

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Solution

The fourth proportional to 248.55, 342.11 and 217.38 is: 299.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.55 : 342.11 = 217.38 : x
  2. Step 2: Convert to fraction form
    248.55/342.11 = 217.38/x
  3. Step 3: Cross multiply
    248.55x = 342.11 × 217.38
  4. Step 4: Simplify right side
    248.55x = 74,369.70
  5. Step 5: Solve for x
    x = 74,369.70/248.55
  6. Step 6: Final answer
    x = 299.22

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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.