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Finding the Fourth Proportional to 254.90, 351.76 and 138.46

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Solution

The fourth proportional to 254.90, 351.76 and 138.46 is: 191.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.90 : 351.76 = 138.46 : x
  2. Step 2: Convert to fraction form
    254.90/351.76 = 138.46/x
  3. Step 3: Cross multiply
    254.90x = 351.76 × 138.46
  4. Step 4: Simplify right side
    254.90x = 48,704.34
  5. Step 5: Solve for x
    x = 48,704.34/254.90
  6. Step 6: Final answer
    x = 191.07

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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.