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Finding the Fourth Proportional to 206.39, 309.70 and 84.64

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Solution

The fourth proportional to 206.39, 309.70 and 84.64 is: 127.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.39 : 309.70 = 84.64 : x
  2. Step 2: Convert to fraction form
    206.39/309.70 = 84.64/x
  3. Step 3: Cross multiply
    206.39x = 309.70 × 84.64
  4. Step 4: Simplify right side
    206.39x = 26,212.58
  5. Step 5: Solve for x
    x = 26,212.58/206.39
  6. Step 6: Final answer
    x = 127.01

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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.