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Finding the Fourth Proportional to 263.90, 395.74 and 81.25

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Solution

The fourth proportional to 263.90, 395.74 and 81.25 is: 121.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    263.90 : 395.74 = 81.25 : x
  2. Step 2: Convert to fraction form
    263.90/395.74 = 81.25/x
  3. Step 3: Cross multiply
    263.90x = 395.74 × 81.25
  4. Step 4: Simplify right side
    263.90x = 32,153.47
  5. Step 5: Solve for x
    x = 32,153.47/263.90
  6. Step 6: Final answer
    x = 121.84

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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.