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Finding the Fourth Proportional to 205.72, 308.50 and 68.74

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Solution

The fourth proportional to 205.72, 308.50 and 68.74 is: 103.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.72 : 308.50 = 68.74 : x
  2. Step 2: Convert to fraction form
    205.72/308.50 = 68.74/x
  3. Step 3: Cross multiply
    205.72x = 308.50 × 68.74
  4. Step 4: Simplify right side
    205.72x = 21,206.29
  5. Step 5: Solve for x
    x = 21,206.29/205.72
  6. Step 6: Final answer
    x = 103.08

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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.