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Finding the Fourth Proportional to 309.71, 427.38 and 178.71

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Solution

The fourth proportional to 309.71, 427.38 and 178.71 is: 246.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.71 : 427.38 = 178.71 : x
  2. Step 2: Convert to fraction form
    309.71/427.38 = 178.71/x
  3. Step 3: Cross multiply
    309.71x = 427.38 × 178.71
  4. Step 4: Simplify right side
    309.71x = 76,377.08
  5. Step 5: Solve for x
    x = 76,377.08/309.71
  6. Step 6: Final answer
    x = 246.61

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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.