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Finding the Fourth Proportional to 903.82, 1,355.78 and 254.61

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Solution

The fourth proportional to 903.82, 1,355.78 and 254.61 is: 381.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.82 : 1,355.78 = 254.61 : x
  2. Step 2: Convert to fraction form
    903.82/1,355.78 = 254.61/x
  3. Step 3: Cross multiply
    903.82x = 1,355.78 × 254.61
  4. Step 4: Simplify right side
    903.82x = 345,187.73
  5. Step 5: Solve for x
    x = 345,187.73/903.82
  6. Step 6: Final answer
    x = 381.92

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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.