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Finding the Fourth Proportional to 253.29, 349.50 and 142.74

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Solution

The fourth proportional to 253.29, 349.50 and 142.74 is: 196.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.29 : 349.50 = 142.74 : x
  2. Step 2: Convert to fraction form
    253.29/349.50 = 142.74/x
  3. Step 3: Cross multiply
    253.29x = 349.50 × 142.74
  4. Step 4: Simplify right side
    253.29x = 49,887.63
  5. Step 5: Solve for x
    x = 49,887.63/253.29
  6. Step 6: Final answer
    x = 196.96

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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.