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Finding the Fourth Proportional to 992.79, 1,489.37 and 299.43

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Solution

The fourth proportional to 992.79, 1,489.37 and 299.43 is: 449.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.79 : 1,489.37 = 299.43 : x
  2. Step 2: Convert to fraction form
    992.79/1,489.37 = 299.43/x
  3. Step 3: Cross multiply
    992.79x = 1,489.37 × 299.43
  4. Step 4: Simplify right side
    992.79x = 445,960.56
  5. Step 5: Solve for x
    x = 445,960.56/992.79
  6. Step 6: Final answer
    x = 449.20

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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.