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Finding the Fourth Proportional to 311.04, 429.31 and 186.71

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Solution

The fourth proportional to 311.04, 429.31 and 186.71 is: 257.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.04 : 429.31 = 186.71 : x
  2. Step 2: Convert to fraction form
    311.04/429.31 = 186.71/x
  3. Step 3: Cross multiply
    311.04x = 429.31 × 186.71
  4. Step 4: Simplify right side
    311.04x = 80,153.39
  5. Step 5: Solve for x
    x = 80,153.39/311.04
  6. Step 6: Final answer
    x = 257.69

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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.