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Finding the Fourth Proportional to 309.91, 427.56 and 178.87

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Solution

The fourth proportional to 309.91, 427.56 and 178.87 is: 246.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.91 : 427.56 = 178.87 : x
  2. Step 2: Convert to fraction form
    309.91/427.56 = 178.87/x
  3. Step 3: Cross multiply
    309.91x = 427.56 × 178.87
  4. Step 4: Simplify right side
    309.91x = 76,477.66
  5. Step 5: Solve for x
    x = 76,477.66/309.91
  6. Step 6: Final answer
    x = 246.77

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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.