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Finding the Fourth Proportional to 105.65, 158.46 and 28.61

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Solution

The fourth proportional to 105.65, 158.46 and 28.61 is: 42.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.65 : 158.46 = 28.61 : x
  2. Step 2: Convert to fraction form
    105.65/158.46 = 28.61/x
  3. Step 3: Cross multiply
    105.65x = 158.46 × 28.61
  4. Step 4: Simplify right side
    105.65x = 4,532.75
  5. Step 5: Solve for x
    x = 4,532.75/105.65
  6. Step 6: Final answer
    x = 42.91

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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.