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Finding the Fourth Proportional to 89.23, 133.67 and 70.98

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Solution

The fourth proportional to 89.23, 133.67 and 70.98 is: 106.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.23 : 133.67 = 70.98 : x
  2. Step 2: Convert to fraction form
    89.23/133.67 = 70.98/x
  3. Step 3: Cross multiply
    89.23x = 133.67 × 70.98
  4. Step 4: Simplify right side
    89.23x = 9,487.97
  5. Step 5: Solve for x
    x = 9,487.97/89.23
  6. Step 6: Final answer
    x = 106.33

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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.