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Finding the Fourth Proportional to 992.73, 1,489.21 and 299.42

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Solution

The fourth proportional to 992.73, 1,489.21 and 299.42 is: 449.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.73 : 1,489.21 = 299.42 : x
  2. Step 2: Convert to fraction form
    992.73/1,489.21 = 299.42/x
  3. Step 3: Cross multiply
    992.73x = 1,489.21 × 299.42
  4. Step 4: Simplify right side
    992.73x = 445,901.68
  5. Step 5: Solve for x
    x = 445,901.68/992.73
  6. Step 6: Final answer
    x = 449.17

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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.