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Finding the Fourth Proportional to 109.31, 163.98 and 107.46

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Solution

The fourth proportional to 109.31, 163.98 and 107.46 is: 161.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.31 : 163.98 = 107.46 : x
  2. Step 2: Convert to fraction form
    109.31/163.98 = 107.46/x
  3. Step 3: Cross multiply
    109.31x = 163.98 × 107.46
  4. Step 4: Simplify right side
    109.31x = 17,621.29
  5. Step 5: Solve for x
    x = 17,621.29/109.31
  6. Step 6: Final answer
    x = 161.21

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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.