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Finding the Fourth Proportional to 120.08, 180.24 and 72.08

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Solution

The fourth proportional to 120.08, 180.24 and 72.08 is: 108.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.08 : 180.24 = 72.08 : x
  2. Step 2: Convert to fraction form
    120.08/180.24 = 72.08/x
  3. Step 3: Cross multiply
    120.08x = 180.24 × 72.08
  4. Step 4: Simplify right side
    120.08x = 12,991.70
  5. Step 5: Solve for x
    x = 12,991.70/120.08
  6. Step 6: Final answer
    x = 108.19

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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.