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Finding the Fourth Proportional to 311.25, 429.49 and 171.36

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Solution

The fourth proportional to 311.25, 429.49 and 171.36 is: 236.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.25 : 429.49 = 171.36 : x
  2. Step 2: Convert to fraction form
    311.25/429.49 = 171.36/x
  3. Step 3: Cross multiply
    311.25x = 429.49 × 171.36
  4. Step 4: Simplify right side
    311.25x = 73,597.41
  5. Step 5: Solve for x
    x = 73,597.41/311.25
  6. Step 6: Final answer
    x = 236.46

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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.