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Finding the Fourth Proportional to 113.22, 168.72 and 109.55

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Solution

The fourth proportional to 113.22, 168.72 and 109.55 is: 163.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.22 : 168.72 = 109.55 : x
  2. Step 2: Convert to fraction form
    113.22/168.72 = 109.55/x
  3. Step 3: Cross multiply
    113.22x = 168.72 × 109.55
  4. Step 4: Simplify right side
    113.22x = 18,483.28
  5. Step 5: Solve for x
    x = 18,483.28/113.22
  6. Step 6: Final answer
    x = 163.25

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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.