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Finding the Fourth Proportional to 206.12, 309.01 and 103.28

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Solution

The fourth proportional to 206.12, 309.01 and 103.28 is: 154.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.12 : 309.01 = 103.28 : x
  2. Step 2: Convert to fraction form
    206.12/309.01 = 103.28/x
  3. Step 3: Cross multiply
    206.12x = 309.01 × 103.28
  4. Step 4: Simplify right side
    206.12x = 31,914.55
  5. Step 5: Solve for x
    x = 31,914.55/206.12
  6. Step 6: Final answer
    x = 154.83

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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.