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Finding the Fourth Proportional to 72.23, 108.29 and 31.61

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Solution

The fourth proportional to 72.23, 108.29 and 31.61 is: 47.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.23 : 108.29 = 31.61 : x
  2. Step 2: Convert to fraction form
    72.23/108.29 = 31.61/x
  3. Step 3: Cross multiply
    72.23x = 108.29 × 31.61
  4. Step 4: Simplify right side
    72.23x = 3,422.35
  5. Step 5: Solve for x
    x = 3,422.35/72.23
  6. Step 6: Final answer
    x = 47.38

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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.