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Finding the Fourth Proportional to 206.29, 309.47 and 114.79

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Solution

The fourth proportional to 206.29, 309.47 and 114.79 is: 172.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.29 : 309.47 = 114.79 : x
  2. Step 2: Convert to fraction form
    206.29/309.47 = 114.79/x
  3. Step 3: Cross multiply
    206.29x = 309.47 × 114.79
  4. Step 4: Simplify right side
    206.29x = 35,524.06
  5. Step 5: Solve for x
    x = 35,524.06/206.29
  6. Step 6: Final answer
    x = 172.20

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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.