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Finding the Fourth Proportional to 249.89, 374.81 and 85.30

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Solution

The fourth proportional to 249.89, 374.81 and 85.30 is: 127.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.89 : 374.81 = 85.30 : x
  2. Step 2: Convert to fraction form
    249.89/374.81 = 85.30/x
  3. Step 3: Cross multiply
    249.89x = 374.81 × 85.30
  4. Step 4: Simplify right side
    249.89x = 31,969.97
  5. Step 5: Solve for x
    x = 31,969.97/249.89
  6. Step 6: Final answer
    x = 127.94

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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.