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Finding the Fourth Proportional to 109.30, 163.96 and 28.15

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Solution

The fourth proportional to 109.30, 163.96 and 28.15 is: 42.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.30 : 163.96 = 28.15 : x
  2. Step 2: Convert to fraction form
    109.30/163.96 = 28.15/x
  3. Step 3: Cross multiply
    109.30x = 163.96 × 28.15
  4. Step 4: Simplify right side
    109.30x = 4,614.51
  5. Step 5: Solve for x
    x = 4,614.51/109.30
  6. Step 6: Final answer
    x = 42.22

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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.