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Finding the Fourth Proportional to 312.92, 431.64 and 254.24

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Solution

The fourth proportional to 312.92, 431.64 and 254.24 is: 350.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.92 : 431.64 = 254.24 : x
  2. Step 2: Convert to fraction form
    312.92/431.64 = 254.24/x
  3. Step 3: Cross multiply
    312.92x = 431.64 × 254.24
  4. Step 4: Simplify right side
    312.92x = 109,740.15
  5. Step 5: Solve for x
    x = 109,740.15/312.92
  6. Step 6: Final answer
    x = 350.70

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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.