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Finding the Fourth Proportional to 259.94, 389.80 and 129.89

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Solution

The fourth proportional to 259.94, 389.80 and 129.89 is: 194.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.94 : 389.80 = 129.89 : x
  2. Step 2: Convert to fraction form
    259.94/389.80 = 129.89/x
  3. Step 3: Cross multiply
    259.94x = 389.80 × 129.89
  4. Step 4: Simplify right side
    259.94x = 50,628.85
  5. Step 5: Solve for x
    x = 50,628.85/259.94
  6. Step 6: Final answer
    x = 194.78

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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.