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Finding the Fourth Proportional to 254.78, 381.90 and 124.59

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Solution

The fourth proportional to 254.78, 381.90 and 124.59 is: 186.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.78 : 381.90 = 124.59 : x
  2. Step 2: Convert to fraction form
    254.78/381.90 = 124.59/x
  3. Step 3: Cross multiply
    254.78x = 381.90 × 124.59
  4. Step 4: Simplify right side
    254.78x = 47,580.92
  5. Step 5: Solve for x
    x = 47,580.92/254.78
  6. Step 6: Final answer
    x = 186.75

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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.