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Finding the Fourth Proportional to 120.34, 165.38 and 108.19

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Solution

The fourth proportional to 120.34, 165.38 and 108.19 is: 148.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.34 : 165.38 = 108.19 : x
  2. Step 2: Convert to fraction form
    120.34/165.38 = 108.19/x
  3. Step 3: Cross multiply
    120.34x = 165.38 × 108.19
  4. Step 4: Simplify right side
    120.34x = 17,892.32
  5. Step 5: Solve for x
    x = 17,892.32/120.34
  6. Step 6: Final answer
    x = 148.68

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.