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Finding the Fourth Proportional to 259.41, 388.95 and 129.26

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Solution

The fourth proportional to 259.41, 388.95 and 129.26 is: 193.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.41 : 388.95 = 129.26 : x
  2. Step 2: Convert to fraction form
    259.41/388.95 = 129.26/x
  3. Step 3: Cross multiply
    259.41x = 388.95 × 129.26
  4. Step 4: Simplify right side
    259.41x = 50,273.73
  5. Step 5: Solve for x
    x = 50,273.73/259.41
  6. Step 6: Final answer
    x = 193.80

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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.