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Finding the Fourth Proportional to 254.81, 351.64 and 138.38

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Solution

The fourth proportional to 254.81, 351.64 and 138.38 is: 190.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.81 : 351.64 = 138.38 : x
  2. Step 2: Convert to fraction form
    254.81/351.64 = 138.38/x
  3. Step 3: Cross multiply
    254.81x = 351.64 × 138.38
  4. Step 4: Simplify right side
    254.81x = 48,658.36
  5. Step 5: Solve for x
    x = 48,658.36/254.81
  6. Step 6: Final answer
    x = 190.96

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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.