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Finding the Fourth Proportional to 89.43, 134.62 and 81.05

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Solution

The fourth proportional to 89.43, 134.62 and 81.05 is: 122.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.43 : 134.62 = 81.05 : x
  2. Step 2: Convert to fraction form
    89.43/134.62 = 81.05/x
  3. Step 3: Cross multiply
    89.43x = 134.62 × 81.05
  4. Step 4: Simplify right side
    89.43x = 10,910.08
  5. Step 5: Solve for x
    x = 10,910.08/89.43
  6. Step 6: Final answer
    x = 122.00

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.