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Finding the Fourth Proportional to 72.33, 108.38 and 54.28

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Solution

The fourth proportional to 72.33, 108.38 and 54.28 is: 81.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.33 : 108.38 = 54.28 : x
  2. Step 2: Convert to fraction form
    72.33/108.38 = 54.28/x
  3. Step 3: Cross multiply
    72.33x = 108.38 × 54.28
  4. Step 4: Simplify right side
    72.33x = 5,882.87
  5. Step 5: Solve for x
    x = 5,882.87/72.33
  6. Step 6: Final answer
    x = 81.33

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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.