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Finding the Fourth Proportional to 259.69, 389.43 and 115.39

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Solution

The fourth proportional to 259.69, 389.43 and 115.39 is: 173.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.69 : 389.43 = 115.39 : x
  2. Step 2: Convert to fraction form
    259.69/389.43 = 115.39/x
  3. Step 3: Cross multiply
    259.69x = 389.43 × 115.39
  4. Step 4: Simplify right side
    259.69x = 44,936.33
  5. Step 5: Solve for x
    x = 44,936.33/259.69
  6. Step 6: Final answer
    x = 173.04

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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.