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Finding the Fourth Proportional to 105.91, 158.63 and 98.79

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Solution

The fourth proportional to 105.91, 158.63 and 98.79 is: 147.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.91 : 158.63 = 98.79 : x
  2. Step 2: Convert to fraction form
    105.91/158.63 = 98.79/x
  3. Step 3: Cross multiply
    105.91x = 158.63 × 98.79
  4. Step 4: Simplify right side
    105.91x = 15,670.26
  5. Step 5: Solve for x
    x = 15,670.26/105.91
  6. Step 6: Final answer
    x = 147.97

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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.