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Finding the Fourth Proportional to 287, 396.11 and 170.57

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Solution

The fourth proportional to 287, 396.11 and 170.57 is: 235.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    287 : 396.11 = 170.57 : x
  2. Step 2: Convert to fraction form
    287/396.11 = 170.57/x
  3. Step 3: Cross multiply
    287x = 396.11 × 170.57
  4. Step 4: Simplify right side
    287x = 67,564.48
  5. Step 5: Solve for x
    x = 67,564.48/287
  6. Step 6: Final answer
    x = 235.42

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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.