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Finding the Fourth Proportional to 263.80, 395.58 and 81.16

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Solution

The fourth proportional to 263.80, 395.58 and 81.16 is: 121.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    263.80 : 395.58 = 81.16 : x
  2. Step 2: Convert to fraction form
    263.80/395.58 = 81.16/x
  3. Step 3: Cross multiply
    263.80x = 395.58 × 81.16
  4. Step 4: Simplify right side
    263.80x = 32,105.27
  5. Step 5: Solve for x
    x = 32,105.27/263.80
  6. Step 6: Final answer
    x = 121.70

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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.