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Finding the Fourth Proportional to 120.21, 179.85 and 89.91

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Solution

The fourth proportional to 120.21, 179.85 and 89.91 is: 134.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.21 : 179.85 = 89.91 : x
  2. Step 2: Convert to fraction form
    120.21/179.85 = 89.91/x
  3. Step 3: Cross multiply
    120.21x = 179.85 × 89.91
  4. Step 4: Simplify right side
    120.21x = 16,170.31
  5. Step 5: Solve for x
    x = 16,170.31/120.21
  6. Step 6: Final answer
    x = 134.52

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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.