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Finding the Fourth Proportional to 312.75, 431.43 and 196.11

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Solution

The fourth proportional to 312.75, 431.43 and 196.11 is: 270.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.75 : 431.43 = 196.11 : x
  2. Step 2: Convert to fraction form
    312.75/431.43 = 196.11/x
  3. Step 3: Cross multiply
    312.75x = 431.43 × 196.11
  4. Step 4: Simplify right side
    312.75x = 84,607.74
  5. Step 5: Solve for x
    x = 84,607.74/312.75
  6. Step 6: Final answer
    x = 270.53

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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.