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Finding the Fourth Proportional to 72.21, 108.28 and 26.55

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Solution

The fourth proportional to 72.21, 108.28 and 26.55 is: 39.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.21 : 108.28 = 26.55 : x
  2. Step 2: Convert to fraction form
    72.21/108.28 = 26.55/x
  3. Step 3: Cross multiply
    72.21x = 108.28 × 26.55
  4. Step 4: Simplify right side
    72.21x = 2,874.16
  5. Step 5: Solve for x
    x = 2,874.16/72.21
  6. Step 6: Final answer
    x = 39.81

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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.