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Finding the Fourth Proportional to 287.66, 396.75 and 171.20

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Solution

The fourth proportional to 287.66, 396.75 and 171.20 is: 236.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.66 : 396.75 = 171.20 : x
  2. Step 2: Convert to fraction form
    287.66/396.75 = 171.20/x
  3. Step 3: Cross multiply
    287.66x = 396.75 × 171.20
  4. Step 4: Simplify right side
    287.66x = 67,923.60
  5. Step 5: Solve for x
    x = 67,923.60/287.66
  6. Step 6: Final answer
    x = 236.12

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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.