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Finding the Fourth Proportional to 310.39, 428.22 and 186

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Solution

The fourth proportional to 310.39, 428.22 and 186 is: 256.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.39 : 428.22 = 186 : x
  2. Step 2: Convert to fraction form
    310.39/428.22 = 186/x
  3. Step 3: Cross multiply
    310.39x = 428.22 × 186
  4. Step 4: Simplify right side
    310.39x = 79,648.92
  5. Step 5: Solve for x
    x = 79,648.92/310.39
  6. Step 6: Final answer
    x = 256.61

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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.