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Finding the Fourth Proportional to 263.84, 395.72 and 81.22

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Solution

The fourth proportional to 263.84, 395.72 and 81.22 is: 121.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    263.84 : 395.72 = 81.22 : x
  2. Step 2: Convert to fraction form
    263.84/395.72 = 81.22/x
  3. Step 3: Cross multiply
    263.84x = 395.72 × 81.22
  4. Step 4: Simplify right side
    263.84x = 32,140.38
  5. Step 5: Solve for x
    x = 32,140.38/263.84
  6. Step 6: Final answer
    x = 121.82

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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.