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Finding the Fourth Proportional to 72.22, 108.31 and 28.86

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Solution

The fourth proportional to 72.22, 108.31 and 28.86 is: 43.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.22 : 108.31 = 28.86 : x
  2. Step 2: Convert to fraction form
    72.22/108.31 = 28.86/x
  3. Step 3: Cross multiply
    72.22x = 108.31 × 28.86
  4. Step 4: Simplify right side
    72.22x = 3,125.83
  5. Step 5: Solve for x
    x = 3,125.83/72.22
  6. Step 6: Final answer
    x = 43.28

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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.