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Finding the Fourth Proportional to 89.11, 122.90 and 68.34

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Solution

The fourth proportional to 89.11, 122.90 and 68.34 is: 94.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.11 : 122.90 = 68.34 : x
  2. Step 2: Convert to fraction form
    89.11/122.90 = 68.34/x
  3. Step 3: Cross multiply
    89.11x = 122.90 × 68.34
  4. Step 4: Simplify right side
    89.11x = 8,398.99
  5. Step 5: Solve for x
    x = 8,398.99/89.11
  6. Step 6: Final answer
    x = 94.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.