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Finding the Fourth Proportional to 309.86, 427.60 and 178.86

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Solution

The fourth proportional to 309.86, 427.60 and 178.86 is: 246.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.86 : 427.60 = 178.86 : x
  2. Step 2: Convert to fraction form
    309.86/427.60 = 178.86/x
  3. Step 3: Cross multiply
    309.86x = 427.60 × 178.86
  4. Step 4: Simplify right side
    309.86x = 76,480.54
  5. Step 5: Solve for x
    x = 76,480.54/309.86
  6. Step 6: Final answer
    x = 246.82

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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.