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Finding the Fourth Proportional to 253.28, 349.57 and 142.80

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Solution

The fourth proportional to 253.28, 349.57 and 142.80 is: 197.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.28 : 349.57 = 142.80 : x
  2. Step 2: Convert to fraction form
    253.28/349.57 = 142.80/x
  3. Step 3: Cross multiply
    253.28x = 349.57 × 142.80
  4. Step 4: Simplify right side
    253.28x = 49,918.24
  5. Step 5: Solve for x
    x = 49,918.24/253.28
  6. Step 6: Final answer
    x = 197.09

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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.