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Finding the Fourth Proportional to 120.36, 180.74 and 66.49

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Solution

The fourth proportional to 120.36, 180.74 and 66.49 is: 99.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.36 : 180.74 = 66.49 : x
  2. Step 2: Convert to fraction form
    120.36/180.74 = 66.49/x
  3. Step 3: Cross multiply
    120.36x = 180.74 × 66.49
  4. Step 4: Simplify right side
    120.36x = 12,017.40
  5. Step 5: Solve for x
    x = 12,017.40/120.36
  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.