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Finding the Fourth Proportional to 109.53, 163.68 and 80.45

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Solution

The fourth proportional to 109.53, 163.68 and 80.45 is: 120.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.53 : 163.68 = 80.45 : x
  2. Step 2: Convert to fraction form
    109.53/163.68 = 80.45/x
  3. Step 3: Cross multiply
    109.53x = 163.68 × 80.45
  4. Step 4: Simplify right side
    109.53x = 13,167.24
  5. Step 5: Solve for x
    x = 13,167.24/109.53
  6. Step 6: Final answer
    x = 120.22

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.