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Finding the Fourth Proportional to 89.08, 122.79 and 67.21

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Solution

The fourth proportional to 89.08, 122.79 and 67.21 is: 92.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.08 : 122.79 = 67.21 : x
  2. Step 2: Convert to fraction form
    89.08/122.79 = 67.21/x
  3. Step 3: Cross multiply
    89.08x = 122.79 × 67.21
  4. Step 4: Simplify right side
    89.08x = 8,252.72
  5. Step 5: Solve for x
    x = 8,252.72/89.08
  6. Step 6: Final answer
    x = 92.64

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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.