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Finding the Fourth Proportional to 108.93, 163.09 and 72.79

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Solution

The fourth proportional to 108.93, 163.09 and 72.79 is: 108.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.93 : 163.09 = 72.79 : x
  2. Step 2: Convert to fraction form
    108.93/163.09 = 72.79/x
  3. Step 3: Cross multiply
    108.93x = 163.09 × 72.79
  4. Step 4: Simplify right side
    108.93x = 11,871.32
  5. Step 5: Solve for x
    x = 11,871.32/108.93
  6. Step 6: Final answer
    x = 108.98

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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.