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Finding the Fourth Proportional to 254.86, 351.71 and 138.42

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Solution

The fourth proportional to 254.86, 351.71 and 138.42 is: 191.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.86 : 351.71 = 138.42 : x
  2. Step 2: Convert to fraction form
    254.86/351.71 = 138.42/x
  3. Step 3: Cross multiply
    254.86x = 351.71 × 138.42
  4. Step 4: Simplify right side
    254.86x = 48,684.32
  5. Step 5: Solve for x
    x = 48,684.32/254.86
  6. Step 6: Final answer
    x = 191.02

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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.