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Finding the Fourth Proportional to 312.25, 468.38 and 81.12

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Solution

The fourth proportional to 312.25, 468.38 and 81.12 is: 121.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.25 : 468.38 = 81.12 : x
  2. Step 2: Convert to fraction form
    312.25/468.38 = 81.12/x
  3. Step 3: Cross multiply
    312.25x = 468.38 × 81.12
  4. Step 4: Simplify right side
    312.25x = 37,996.72
  5. Step 5: Solve for x
    x = 37,996.72/312.25
  6. Step 6: Final answer
    x = 121.69

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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.