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Finding the Fourth Proportional to 206.19, 309.27 and 84.45

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Solution

The fourth proportional to 206.19, 309.27 and 84.45 is: 126.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.19 : 309.27 = 84.45 : x
  2. Step 2: Convert to fraction form
    206.19/309.27 = 84.45/x
  3. Step 3: Cross multiply
    206.19x = 309.27 × 84.45
  4. Step 4: Simplify right side
    206.19x = 26,116.38
  5. Step 5: Solve for x
    x = 26,116.38/206.19
  6. Step 6: Final answer
    x = 126.66

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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.