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Finding the Fourth Proportional to 310.80, 428.82 and 186.43

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Solution

The fourth proportional to 310.80, 428.82 and 186.43 is: 257.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.80 : 428.82 = 186.43 : x
  2. Step 2: Convert to fraction form
    310.80/428.82 = 186.43/x
  3. Step 3: Cross multiply
    310.80x = 428.82 × 186.43
  4. Step 4: Simplify right side
    310.80x = 79,944.91
  5. Step 5: Solve for x
    x = 79,944.91/310.80
  6. Step 6: Final answer
    x = 257.22

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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.