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Finding the Fourth Proportional to 259.28, 389 and 105.27

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Solution

The fourth proportional to 259.28, 389 and 105.27 is: 157.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.28 : 389 = 105.27 : x
  2. Step 2: Convert to fraction form
    259.28/389 = 105.27/x
  3. Step 3: Cross multiply
    259.28x = 389 × 105.27
  4. Step 4: Simplify right side
    259.28x = 40,950.03
  5. Step 5: Solve for x
    x = 40,950.03/259.28
  6. Step 6: Final answer
    x = 157.94

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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.