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Finding the Fourth Proportional to 204.39, 306.09 and 139.16

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Solution

The fourth proportional to 204.39, 306.09 and 139.16 is: 208.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.39 : 306.09 = 139.16 : x
  2. Step 2: Convert to fraction form
    204.39/306.09 = 139.16/x
  3. Step 3: Cross multiply
    204.39x = 306.09 × 139.16
  4. Step 4: Simplify right side
    204.39x = 42,593.26
  5. Step 5: Solve for x
    x = 42,593.26/204.39
  6. Step 6: Final answer
    x = 208.40

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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.