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Finding the Fourth Proportional to 311.94, 468.32 and 261.32

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Solution

The fourth proportional to 311.94, 468.32 and 261.32 is: 392.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.94 : 468.32 = 261.32 : x
  2. Step 2: Convert to fraction form
    311.94/468.32 = 261.32/x
  3. Step 3: Cross multiply
    311.94x = 468.32 × 261.32
  4. Step 4: Simplify right side
    311.94x = 122,377.73
  5. Step 5: Solve for x
    x = 122,377.73/311.94
  6. Step 6: Final answer
    x = 392.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.