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Finding the Fourth Proportional to 115.91, 173.79 and 70.28

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Solution

The fourth proportional to 115.91, 173.79 and 70.28 is: 105.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.91 : 173.79 = 70.28 : x
  2. Step 2: Convert to fraction form
    115.91/173.79 = 70.28/x
  3. Step 3: Cross multiply
    115.91x = 173.79 × 70.28
  4. Step 4: Simplify right side
    115.91x = 12,213.09
  5. Step 5: Solve for x
    x = 12,213.09/115.91
  6. Step 6: Final answer
    x = 105.37

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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.