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Finding the Fourth Proportional to 253.45, 349.74 and 142.94

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Solution

The fourth proportional to 253.45, 349.74 and 142.94 is: 197.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.45 : 349.74 = 142.94 : x
  2. Step 2: Convert to fraction form
    253.45/349.74 = 142.94/x
  3. Step 3: Cross multiply
    253.45x = 349.74 × 142.94
  4. Step 4: Simplify right side
    253.45x = 49,991.84
  5. Step 5: Solve for x
    x = 49,991.84/253.45
  6. Step 6: Final answer
    x = 197.25

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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.