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Finding the Fourth Proportional to 89.51, 134.36 and 80.51

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Solution

The fourth proportional to 89.51, 134.36 and 80.51 is: 120.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.51 : 134.36 = 80.51 : x
  2. Step 2: Convert to fraction form
    89.51/134.36 = 80.51/x
  3. Step 3: Cross multiply
    89.51x = 134.36 × 80.51
  4. Step 4: Simplify right side
    89.51x = 10,816.92
  5. Step 5: Solve for x
    x = 10,816.92/89.51
  6. Step 6: Final answer
    x = 120.85

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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.