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Finding the Fourth Proportional to 120.98, 180.98 and 109.74

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Solution

The fourth proportional to 120.98, 180.98 and 109.74 is: 164.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.98 : 180.98 = 109.74 : x
  2. Step 2: Convert to fraction form
    120.98/180.98 = 109.74/x
  3. Step 3: Cross multiply
    120.98x = 180.98 × 109.74
  4. Step 4: Simplify right side
    120.98x = 19,860.75
  5. Step 5: Solve for x
    x = 19,860.75/120.98
  6. Step 6: Final answer
    x = 164.17

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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.