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Finding the Fourth Proportional to 259.40, 388.17 and 208.37

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Solution

The fourth proportional to 259.40, 388.17 and 208.37 is: 311.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.40 : 388.17 = 208.37 : x
  2. Step 2: Convert to fraction form
    259.40/388.17 = 208.37/x
  3. Step 3: Cross multiply
    259.40x = 388.17 × 208.37
  4. Step 4: Simplify right side
    259.40x = 80,882.98
  5. Step 5: Solve for x
    x = 80,882.98/259.40
  6. Step 6: Final answer
    x = 311.81

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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.