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Finding the Fourth Proportional to 990.67, 1,485.46 and 443.38

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Solution

The fourth proportional to 990.67, 1,485.46 and 443.38 is: 664.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.67 : 1,485.46 = 443.38 : x
  2. Step 2: Convert to fraction form
    990.67/1,485.46 = 443.38/x
  3. Step 3: Cross multiply
    990.67x = 1,485.46 × 443.38
  4. Step 4: Simplify right side
    990.67x = 658,623.25
  5. Step 5: Solve for x
    x = 658,623.25/990.67
  6. Step 6: Final answer
    x = 664.83

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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.