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Finding the Fourth Proportional to 259.63, 389.34 and 129.59

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Solution

The fourth proportional to 259.63, 389.34 and 129.59 is: 194.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.63 : 389.34 = 129.59 : x
  2. Step 2: Convert to fraction form
    259.63/389.34 = 129.59/x
  3. Step 3: Cross multiply
    259.63x = 389.34 × 129.59
  4. Step 4: Simplify right side
    259.63x = 50,452.62
  5. Step 5: Solve for x
    x = 50,452.62/259.63
  6. Step 6: Final answer
    x = 194.33

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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.