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Finding the Fourth Proportional to 254.78, 351.60 and 138.34

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Solution

The fourth proportional to 254.78, 351.60 and 138.34 is: 190.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.78 : 351.60 = 138.34 : x
  2. Step 2: Convert to fraction form
    254.78/351.60 = 138.34/x
  3. Step 3: Cross multiply
    254.78x = 351.60 × 138.34
  4. Step 4: Simplify right side
    254.78x = 48,640.34
  5. Step 5: Solve for x
    x = 48,640.34/254.78
  6. Step 6: Final answer
    x = 190.91

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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.