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Finding the Fourth Proportional to 89.21, 133.97 and 68.87

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Solution

The fourth proportional to 89.21, 133.97 and 68.87 is: 103.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.21 : 133.97 = 68.87 : x
  2. Step 2: Convert to fraction form
    89.21/133.97 = 68.87/x
  3. Step 3: Cross multiply
    89.21x = 133.97 × 68.87
  4. Step 4: Simplify right side
    89.21x = 9,225.50
  5. Step 5: Solve for x
    x = 9,225.50/89.21
  6. Step 6: Final answer
    x = 103.42

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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.