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Finding the Fourth Proportional to 286.90, 396 and 170.48

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Solution

The fourth proportional to 286.90, 396 and 170.48 is: 235.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.90 : 396 = 170.48 : x
  2. Step 2: Convert to fraction form
    286.90/396 = 170.48/x
  3. Step 3: Cross multiply
    286.90x = 396 × 170.48
  4. Step 4: Simplify right side
    286.90x = 67,510.08
  5. Step 5: Solve for x
    x = 67,510.08/286.90
  6. Step 6: Final answer
    x = 235.31

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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.