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Finding the Fourth Proportional to 120.29, 165.66 and 103.91

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Solution

The fourth proportional to 120.29, 165.66 and 103.91 is: 143.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.29 : 165.66 = 103.91 : x
  2. Step 2: Convert to fraction form
    120.29/165.66 = 103.91/x
  3. Step 3: Cross multiply
    120.29x = 165.66 × 103.91
  4. Step 4: Simplify right side
    120.29x = 17,212.90
  5. Step 5: Solve for x
    x = 17,212.90/120.29
  6. Step 6: Final answer
    x = 143.10

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.