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Finding the Fourth Proportional to 254.37, 381.38 and 138.72

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Solution

The fourth proportional to 254.37, 381.38 and 138.72 is: 207.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.37 : 381.38 = 138.72 : x
  2. Step 2: Convert to fraction form
    254.37/381.38 = 138.72/x
  3. Step 3: Cross multiply
    254.37x = 381.38 × 138.72
  4. Step 4: Simplify right side
    254.37x = 52,902.43
  5. Step 5: Solve for x
    x = 52,902.43/254.37
  6. Step 6: Final answer
    x = 207.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.