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Finding the Fourth Proportional to 792.90, 1,189.28 and 272.85

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Solution

The fourth proportional to 792.90, 1,189.28 and 272.85 is: 409.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.90 : 1,189.28 = 272.85 : x
  2. Step 2: Convert to fraction form
    792.90/1,189.28 = 272.85/x
  3. Step 3: Cross multiply
    792.90x = 1,189.28 × 272.85
  4. Step 4: Simplify right side
    792.90x = 324,493.68
  5. Step 5: Solve for x
    x = 324,493.68/792.90
  6. Step 6: Final answer
    x = 409.25

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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.