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Finding the Fourth Proportional to 309.89, 427.79 and 178.87

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Solution

The fourth proportional to 309.89, 427.79 and 178.87 is: 246.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.89 : 427.79 = 178.87 : x
  2. Step 2: Convert to fraction form
    309.89/427.79 = 178.87/x
  3. Step 3: Cross multiply
    309.89x = 427.79 × 178.87
  4. Step 4: Simplify right side
    309.89x = 76,519.11
  5. Step 5: Solve for x
    x = 76,519.11/309.89
  6. Step 6: Final answer
    x = 246.92

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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.