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Finding the Fourth Proportional to 120.36, 180.50 and 66.20

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Solution

The fourth proportional to 120.36, 180.50 and 66.20 is: 99.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.36 : 180.50 = 66.20 : x
  2. Step 2: Convert to fraction form
    120.36/180.50 = 66.20/x
  3. Step 3: Cross multiply
    120.36x = 180.50 × 66.20
  4. Step 4: Simplify right side
    120.36x = 11,949.10
  5. Step 5: Solve for x
    x = 11,949.10/120.36
  6. Step 6: Final answer
    x = 99.28

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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.