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Finding the Fourth Proportional to 268.78, 401.22 and 248.74

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Solution

The fourth proportional to 268.78, 401.22 and 248.74 is: 371.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.78 : 401.22 = 248.74 : x
  2. Step 2: Convert to fraction form
    268.78/401.22 = 248.74/x
  3. Step 3: Cross multiply
    268.78x = 401.22 × 248.74
  4. Step 4: Simplify right side
    268.78x = 99,799.46
  5. Step 5: Solve for x
    x = 99,799.46/268.78
  6. Step 6: Final answer
    x = 371.31

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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.