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Finding the Fourth Proportional to 109.49, 164.19 and 85.14

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Solution

The fourth proportional to 109.49, 164.19 and 85.14 is: 127.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.49 : 164.19 = 85.14 : x
  2. Step 2: Convert to fraction form
    109.49/164.19 = 85.14/x
  3. Step 3: Cross multiply
    109.49x = 164.19 × 85.14
  4. Step 4: Simplify right side
    109.49x = 13,979.30
  5. Step 5: Solve for x
    x = 13,979.30/109.49
  6. Step 6: Final answer
    x = 127.68

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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.