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Finding the Fourth Proportional to 792.42, 1,189.22 and 299.28

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Solution

The fourth proportional to 792.42, 1,189.22 and 299.28 is: 449.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.42 : 1,189.22 = 299.28 : x
  2. Step 2: Convert to fraction form
    792.42/1,189.22 = 299.28/x
  3. Step 3: Cross multiply
    792.42x = 1,189.22 × 299.28
  4. Step 4: Simplify right side
    792.42x = 355,908.27
  5. Step 5: Solve for x
    x = 355,908.27/792.42
  6. Step 6: Final answer
    x = 449.14

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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.