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Finding the Fourth Proportional to 206.39, 309.68 and 98.19

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Solution

The fourth proportional to 206.39, 309.68 and 98.19 is: 147.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.39 : 309.68 = 98.19 : x
  2. Step 2: Convert to fraction form
    206.39/309.68 = 98.19/x
  3. Step 3: Cross multiply
    206.39x = 309.68 × 98.19
  4. Step 4: Simplify right side
    206.39x = 30,407.72
  5. Step 5: Solve for x
    x = 30,407.72/206.39
  6. Step 6: Final answer
    x = 147.33

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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.