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Finding the Fourth Proportional to 109.35, 163.67 and 80.00

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Solution

The fourth proportional to 109.35, 163.67 and 80.00 is: 119.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.35 : 163.67 = 80.00 : x
  2. Step 2: Convert to fraction form
    109.35/163.67 = 80.00/x
  3. Step 3: Cross multiply
    109.35x = 163.67 × 80.00
  4. Step 4: Simplify right side
    109.35x = 13,094.01
  5. Step 5: Solve for x
    x = 13,094.01/109.35
  6. Step 6: Final answer
    x = 119.75

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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.