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Finding the Fourth Proportional to 105.80, 158.70 and 69.89

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Solution

The fourth proportional to 105.80, 158.70 and 69.89 is: 104.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.80 : 158.70 = 69.89 : x
  2. Step 2: Convert to fraction form
    105.80/158.70 = 69.89/x
  3. Step 3: Cross multiply
    105.80x = 158.70 × 69.89
  4. Step 4: Simplify right side
    105.80x = 11,091.54
  5. Step 5: Solve for x
    x = 11,091.54/105.80
  6. Step 6: Final answer
    x = 104.84

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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.