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Finding the Fourth Proportional to 109.20, 163.14 and 109.20

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Solution

The fourth proportional to 109.20, 163.14 and 109.20 is: 163.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.20 : 163.14 = 109.20 : x
  2. Step 2: Convert to fraction form
    109.20/163.14 = 109.20/x
  3. Step 3: Cross multiply
    109.20x = 163.14 × 109.20
  4. Step 4: Simplify right side
    109.20x = 17,814.89
  5. Step 5: Solve for x
    x = 17,814.89/109.20
  6. Step 6: Final answer
    x = 163.14

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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.