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Finding the Fourth Proportional to 254.79, 381.99 and 81.35

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Solution

The fourth proportional to 254.79, 381.99 and 81.35 is: 121.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.79 : 381.99 = 81.35 : x
  2. Step 2: Convert to fraction form
    254.79/381.99 = 81.35/x
  3. Step 3: Cross multiply
    254.79x = 381.99 × 81.35
  4. Step 4: Simplify right side
    254.79x = 31,076.86
  5. Step 5: Solve for x
    x = 31,076.86/254.79
  6. Step 6: Final answer
    x = 121.97

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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.