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Finding the Fourth Proportional to 72.25, 108.42 and 31.67

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Solution

The fourth proportional to 72.25, 108.42 and 31.67 is: 47.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.25 : 108.42 = 31.67 : x
  2. Step 2: Convert to fraction form
    72.25/108.42 = 31.67/x
  3. Step 3: Cross multiply
    72.25x = 108.42 × 31.67
  4. Step 4: Simplify right side
    72.25x = 3,433.50
  5. Step 5: Solve for x
    x = 3,433.50/72.25
  6. Step 6: Final answer
    x = 47.52

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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.