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Finding the Fourth Proportional to 275.78, 380.31 and 187.33

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Solution

The fourth proportional to 275.78, 380.31 and 187.33 is: 258.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.78 : 380.31 = 187.33 : x
  2. Step 2: Convert to fraction form
    275.78/380.31 = 187.33/x
  3. Step 3: Cross multiply
    275.78x = 380.31 × 187.33
  4. Step 4: Simplify right side
    275.78x = 71,243.47
  5. Step 5: Solve for x
    x = 71,243.47/275.78
  6. Step 6: Final answer
    x = 258.33

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.