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Finding the Fourth Proportional to 275.50, 380.28 and 172

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Solution

The fourth proportional to 275.50, 380.28 and 172 is: 237.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.50 : 380.28 = 172 : x
  2. Step 2: Convert to fraction form
    275.50/380.28 = 172/x
  3. Step 3: Cross multiply
    275.50x = 380.28 × 172
  4. Step 4: Simplify right side
    275.50x = 65,408.16
  5. Step 5: Solve for x
    x = 65,408.16/275.50
  6. Step 6: Final answer
    x = 237.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.