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Finding the Fourth Proportional to 120.66, 181.61 and 103.04

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Solution

The fourth proportional to 120.66, 181.61 and 103.04 is: 155.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.66 : 181.61 = 103.04 : x
  2. Step 2: Convert to fraction form
    120.66/181.61 = 103.04/x
  3. Step 3: Cross multiply
    120.66x = 181.61 × 103.04
  4. Step 4: Simplify right side
    120.66x = 18,712.74
  5. Step 5: Solve for x
    x = 18,712.74/120.66
  6. Step 6: Final answer
    x = 155.09

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.