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Finding the Fourth Proportional to 254.76, 381.87 and 126.51

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Solution

The fourth proportional to 254.76, 381.87 and 126.51 is: 189.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.76 : 381.87 = 126.51 : x
  2. Step 2: Convert to fraction form
    254.76/381.87 = 126.51/x
  3. Step 3: Cross multiply
    254.76x = 381.87 × 126.51
  4. Step 4: Simplify right side
    254.76x = 48,310.37
  5. Step 5: Solve for x
    x = 48,310.37/254.76
  6. Step 6: Final answer
    x = 189.63

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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.