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Finding the Fourth Proportional to 109.32, 162.96 and 108.60

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Solution

The fourth proportional to 109.32, 162.96 and 108.60 is: 161.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.32 : 162.96 = 108.60 : x
  2. Step 2: Convert to fraction form
    109.32/162.96 = 108.60/x
  3. Step 3: Cross multiply
    109.32x = 162.96 × 108.60
  4. Step 4: Simplify right side
    109.32x = 17,697.46
  5. Step 5: Solve for x
    x = 17,697.46/109.32
  6. Step 6: Final answer
    x = 161.89

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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.