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Finding the Fourth Proportional to 105.92, 158.13 and 89.72

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Solution

The fourth proportional to 105.92, 158.13 and 89.72 is: 133.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.92 : 158.13 = 89.72 : x
  2. Step 2: Convert to fraction form
    105.92/158.13 = 89.72/x
  3. Step 3: Cross multiply
    105.92x = 158.13 × 89.72
  4. Step 4: Simplify right side
    105.92x = 14,186.98
  5. Step 5: Solve for x
    x = 14,186.98/105.92
  6. Step 6: Final answer
    x = 133.94

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.