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Finding the Fourth Proportional to 253.42, 349.70 and 142.90

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Solution

The fourth proportional to 253.42, 349.70 and 142.90 is: 197.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.42 : 349.70 = 142.90 : x
  2. Step 2: Convert to fraction form
    253.42/349.70 = 142.90/x
  3. Step 3: Cross multiply
    253.42x = 349.70 × 142.90
  4. Step 4: Simplify right side
    253.42x = 49,972.13
  5. Step 5: Solve for x
    x = 49,972.13/253.42
  6. Step 6: Final answer
    x = 197.19

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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.