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Finding the Fourth Proportional to 206.30, 309.49 and 115.02

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Solution

The fourth proportional to 206.30, 309.49 and 115.02 is: 172.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.30 : 309.49 = 115.02 : x
  2. Step 2: Convert to fraction form
    206.30/309.49 = 115.02/x
  3. Step 3: Cross multiply
    206.30x = 309.49 × 115.02
  4. Step 4: Simplify right side
    206.30x = 35,597.54
  5. Step 5: Solve for x
    x = 35,597.54/206.30
  6. Step 6: Final answer
    x = 172.55

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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.