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Finding the Fourth Proportional to 109.58, 163.98 and 79.34

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Solution

The fourth proportional to 109.58, 163.98 and 79.34 is: 118.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.58 : 163.98 = 79.34 : x
  2. Step 2: Convert to fraction form
    109.58/163.98 = 79.34/x
  3. Step 3: Cross multiply
    109.58x = 163.98 × 79.34
  4. Step 4: Simplify right side
    109.58x = 13,009.35
  5. Step 5: Solve for x
    x = 13,009.35/109.58
  6. Step 6: Final answer
    x = 118.73

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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.