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Finding the Fourth Proportional to 253.25, 349.43 and 142.71

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Solution

The fourth proportional to 253.25, 349.43 and 142.71 is: 196.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.25 : 349.43 = 142.71 : x
  2. Step 2: Convert to fraction form
    253.25/349.43 = 142.71/x
  3. Step 3: Cross multiply
    253.25x = 349.43 × 142.71
  4. Step 4: Simplify right side
    253.25x = 49,866.44
  5. Step 5: Solve for x
    x = 49,866.44/253.25
  6. Step 6: Final answer
    x = 196.91

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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.