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Finding the Fourth Proportional to 287.18, 396.31 and 170.72

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Solution

The fourth proportional to 287.18, 396.31 and 170.72 is: 235.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.18 : 396.31 = 170.72 : x
  2. Step 2: Convert to fraction form
    287.18/396.31 = 170.72/x
  3. Step 3: Cross multiply
    287.18x = 396.31 × 170.72
  4. Step 4: Simplify right side
    287.18x = 67,657.44
  5. Step 5: Solve for x
    x = 67,657.44/287.18
  6. Step 6: Final answer
    x = 235.59

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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.