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Finding the Fourth Proportional to 253.29, 349.58 and 211.78

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Solution

The fourth proportional to 253.29, 349.58 and 211.78 is: 292.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.29 : 349.58 = 211.78 : x
  2. Step 2: Convert to fraction form
    253.29/349.58 = 211.78/x
  3. Step 3: Cross multiply
    253.29x = 349.58 × 211.78
  4. Step 4: Simplify right side
    253.29x = 74,034.05
  5. Step 5: Solve for x
    x = 74,034.05/253.29
  6. Step 6: Final answer
    x = 292.29

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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.