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Finding the Fourth Proportional to 89.06, 133.67 and 68.90

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Solution

The fourth proportional to 89.06, 133.67 and 68.90 is: 103.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.06 : 133.67 = 68.90 : x
  2. Step 2: Convert to fraction form
    89.06/133.67 = 68.90/x
  3. Step 3: Cross multiply
    89.06x = 133.67 × 68.90
  4. Step 4: Simplify right side
    89.06x = 9,208.85
  5. Step 5: Solve for x
    x = 9,208.85/89.06
  6. Step 6: Final answer
    x = 103.41

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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.