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Finding the Fourth Proportional to 665.49, 998.35 and 203.21

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Solution

The fourth proportional to 665.49, 998.35 and 203.21 is: 304.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.49 : 998.35 = 203.21 : x
  2. Step 2: Convert to fraction form
    665.49/998.35 = 203.21/x
  3. Step 3: Cross multiply
    665.49x = 998.35 × 203.21
  4. Step 4: Simplify right side
    665.49x = 202,874.70
  5. Step 5: Solve for x
    x = 202,874.70/665.49
  6. Step 6: Final answer
    x = 304.85

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Double scale
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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.