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Finding the Fourth Proportional to 253.62, 379.86 and 172.62

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Solution

The fourth proportional to 253.62, 379.86 and 172.62 is: 258.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.62 : 379.86 = 172.62 : x
  2. Step 2: Convert to fraction form
    253.62/379.86 = 172.62/x
  3. Step 3: Cross multiply
    253.62x = 379.86 × 172.62
  4. Step 4: Simplify right side
    253.62x = 65,571.43
  5. Step 5: Solve for x
    x = 65,571.43/253.62
  6. Step 6: Final answer
    x = 258.54

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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.