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Finding the Fourth Proportional to 205.87, 308.75 and 68.89

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Solution

The fourth proportional to 205.87, 308.75 and 68.89 is: 103.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.87 : 308.75 = 68.89 : x
  2. Step 2: Convert to fraction form
    205.87/308.75 = 68.89/x
  3. Step 3: Cross multiply
    205.87x = 308.75 × 68.89
  4. Step 4: Simplify right side
    205.87x = 21,269.79
  5. Step 5: Solve for x
    x = 21,269.79/205.87
  6. Step 6: Final answer
    x = 103.32

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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.