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Finding the Fourth Proportional to 259.61, 389.81 and 205.94

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Solution

The fourth proportional to 259.61, 389.81 and 205.94 is: 309.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.61 : 389.81 = 205.94 : x
  2. Step 2: Convert to fraction form
    259.61/389.81 = 205.94/x
  3. Step 3: Cross multiply
    259.61x = 389.81 × 205.94
  4. Step 4: Simplify right side
    259.61x = 80,278.96
  5. Step 5: Solve for x
    x = 80,278.96/259.61
  6. Step 6: Final answer
    x = 309.24

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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.