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Finding the Fourth Proportional to 312.92, 431.62 and 206.56

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Solution

The fourth proportional to 312.92, 431.62 and 206.56 is: 284.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.92 : 431.62 = 206.56 : x
  2. Step 2: Convert to fraction form
    312.92/431.62 = 206.56/x
  3. Step 3: Cross multiply
    312.92x = 431.62 × 206.56
  4. Step 4: Simplify right side
    312.92x = 89,155.43
  5. Step 5: Solve for x
    x = 89,155.43/312.92
  6. Step 6: Final answer
    x = 284.91

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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.