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Finding the Fourth Proportional to 311.19, 429.42 and 171.28

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Solution

The fourth proportional to 311.19, 429.42 and 171.28 is: 236.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.19 : 429.42 = 171.28 : x
  2. Step 2: Convert to fraction form
    311.19/429.42 = 171.28/x
  3. Step 3: Cross multiply
    311.19x = 429.42 × 171.28
  4. Step 4: Simplify right side
    311.19x = 73,551.06
  5. Step 5: Solve for x
    x = 73,551.06/311.19
  6. Step 6: Final answer
    x = 236.35

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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.