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Finding the Fourth Proportional to 255.40, 380.63 and 249.46

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Solution

The fourth proportional to 255.40, 380.63 and 249.46 is: 371.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.40 : 380.63 = 249.46 : x
  2. Step 2: Convert to fraction form
    255.40/380.63 = 249.46/x
  3. Step 3: Cross multiply
    255.40x = 380.63 × 249.46
  4. Step 4: Simplify right side
    255.40x = 94,951.96
  5. Step 5: Solve for x
    x = 94,951.96/255.40
  6. Step 6: Final answer
    x = 371.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.