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Finding the Fourth Proportional to 989.23, 1,483.87 and 331.12

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Solution

The fourth proportional to 989.23, 1,483.87 and 331.12 is: 496.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.23 : 1,483.87 = 331.12 : x
  2. Step 2: Convert to fraction form
    989.23/1,483.87 = 331.12/x
  3. Step 3: Cross multiply
    989.23x = 1,483.87 × 331.12
  4. Step 4: Simplify right side
    989.23x = 491,331.62
  5. Step 5: Solve for x
    x = 491,331.62/989.23
  6. Step 6: Final answer
    x = 496.68

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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.