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Finding the Fourth Proportional to 792.78, 1,189.12 and 272.82

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Solution

The fourth proportional to 792.78, 1,189.12 and 272.82 is: 409.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.78 : 1,189.12 = 272.82 : x
  2. Step 2: Convert to fraction form
    792.78/1,189.12 = 272.82/x
  3. Step 3: Cross multiply
    792.78x = 1,189.12 × 272.82
  4. Step 4: Simplify right side
    792.78x = 324,415.72
  5. Step 5: Solve for x
    x = 324,415.72/792.78
  6. Step 6: Final answer
    x = 409.21

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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.