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Finding the Fourth Proportional to 309.75, 427.35 and 178.71

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Solution

The fourth proportional to 309.75, 427.35 and 178.71 is: 246.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.75 : 427.35 = 178.71 : x
  2. Step 2: Convert to fraction form
    309.75/427.35 = 178.71/x
  3. Step 3: Cross multiply
    309.75x = 427.35 × 178.71
  4. Step 4: Simplify right side
    309.75x = 76,371.72
  5. Step 5: Solve for x
    x = 76,371.72/309.75
  6. Step 6: Final answer
    x = 246.56

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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.