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Finding the Fourth Proportional to 263.97, 395.55 and 172.80

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Solution

The fourth proportional to 263.97, 395.55 and 172.80 is: 258.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    263.97 : 395.55 = 172.80 : x
  2. Step 2: Convert to fraction form
    263.97/395.55 = 172.80/x
  3. Step 3: Cross multiply
    263.97x = 395.55 × 172.80
  4. Step 4: Simplify right side
    263.97x = 68,351.04
  5. Step 5: Solve for x
    x = 68,351.04/263.97
  6. Step 6: Final answer
    x = 258.93

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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.