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Finding the Fourth Proportional to 312.42, 431.76 and 269.48

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Solution

The fourth proportional to 312.42, 431.76 and 269.48 is: 372.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.42 : 431.76 = 269.48 : x
  2. Step 2: Convert to fraction form
    312.42/431.76 = 269.48/x
  3. Step 3: Cross multiply
    312.42x = 431.76 × 269.48
  4. Step 4: Simplify right side
    312.42x = 116,350.68
  5. Step 5: Solve for x
    x = 116,350.68/312.42
  6. Step 6: Final answer
    x = 372.42

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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.