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Finding the Fourth Proportional to 72.54, 108.80 and 18.43

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Solution

The fourth proportional to 72.54, 108.80 and 18.43 is: 27.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.54 : 108.80 = 18.43 : x
  2. Step 2: Convert to fraction form
    72.54/108.80 = 18.43/x
  3. Step 3: Cross multiply
    72.54x = 108.80 × 18.43
  4. Step 4: Simplify right side
    72.54x = 2,005.18
  5. Step 5: Solve for x
    x = 2,005.18/72.54
  6. Step 6: Final answer
    x = 27.64

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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.