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Finding the Fourth Proportional to 120.36, 179.79 and 89.76

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Solution

The fourth proportional to 120.36, 179.79 and 89.76 is: 134.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.36 : 179.79 = 89.76 : x
  2. Step 2: Convert to fraction form
    120.36/179.79 = 89.76/x
  3. Step 3: Cross multiply
    120.36x = 179.79 × 89.76
  4. Step 4: Simplify right side
    120.36x = 16,137.95
  5. Step 5: Solve for x
    x = 16,137.95/120.36
  6. Step 6: Final answer
    x = 134.08

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.