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Finding the Fourth Proportional to 204.62, 306.83 and 139.72

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Solution

The fourth proportional to 204.62, 306.83 and 139.72 is: 209.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.62 : 306.83 = 139.72 : x
  2. Step 2: Convert to fraction form
    204.62/306.83 = 139.72/x
  3. Step 3: Cross multiply
    204.62x = 306.83 × 139.72
  4. Step 4: Simplify right side
    204.62x = 42,870.29
  5. Step 5: Solve for x
    x = 42,870.29/204.62
  6. Step 6: Final answer
    x = 209.51

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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.