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Finding the Fourth Proportional to 204.16, 306.36 and 139.21

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Solution

The fourth proportional to 204.16, 306.36 and 139.21 is: 208.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.16 : 306.36 = 139.21 : x
  2. Step 2: Convert to fraction form
    204.16/306.36 = 139.21/x
  3. Step 3: Cross multiply
    204.16x = 306.36 × 139.21
  4. Step 4: Simplify right side
    204.16x = 42,648.38
  5. Step 5: Solve for x
    x = 42,648.38/204.16
  6. Step 6: Final answer
    x = 208.90

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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.