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Finding the Fourth Proportional to 120.73, 181.14 and 66.55

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Solution

The fourth proportional to 120.73, 181.14 and 66.55 is: 99.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.73 : 181.14 = 66.55 : x
  2. Step 2: Convert to fraction form
    120.73/181.14 = 66.55/x
  3. Step 3: Cross multiply
    120.73x = 181.14 × 66.55
  4. Step 4: Simplify right side
    120.73x = 12,054.87
  5. Step 5: Solve for x
    x = 12,054.87/120.73
  6. Step 6: Final answer
    x = 99.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.