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Finding the Fourth Proportional to 309.82, 427.56 and 171.82

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Solution

The fourth proportional to 309.82, 427.56 and 171.82 is: 237.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.82 : 427.56 = 171.82 : x
  2. Step 2: Convert to fraction form
    309.82/427.56 = 171.82/x
  3. Step 3: Cross multiply
    309.82x = 427.56 × 171.82
  4. Step 4: Simplify right side
    309.82x = 73,463.36
  5. Step 5: Solve for x
    x = 73,463.36/309.82
  6. Step 6: Final answer
    x = 237.12

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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.