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Finding the Fourth Proportional to 989.91, 1,484.91 and 331.85

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Solution

The fourth proportional to 989.91, 1,484.91 and 331.85 is: 497.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.91 : 1,484.91 = 331.85 : x
  2. Step 2: Convert to fraction form
    989.91/1,484.91 = 331.85/x
  3. Step 3: Cross multiply
    989.91x = 1,484.91 × 331.85
  4. Step 4: Simplify right side
    989.91x = 492,767.38
  5. Step 5: Solve for x
    x = 492,767.38/989.91
  6. Step 6: Final answer
    x = 497.79

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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.