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Finding the Fourth Proportional to 206.91, 310.28 and 69.89

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Solution

The fourth proportional to 206.91, 310.28 and 69.89 is: 104.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.91 : 310.28 = 69.89 : x
  2. Step 2: Convert to fraction form
    206.91/310.28 = 69.89/x
  3. Step 3: Cross multiply
    206.91x = 310.28 × 69.89
  4. Step 4: Simplify right side
    206.91x = 21,683.57
  5. Step 5: Solve for x
    x = 21,683.57/206.91
  6. Step 6: Final answer
    x = 104.80

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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.