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Finding the Fourth Proportional to 792.57, 1,188.39 and 272.31

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Solution

The fourth proportional to 792.57, 1,188.39 and 272.31 is: 408.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.57 : 1,188.39 = 272.31 : x
  2. Step 2: Convert to fraction form
    792.57/1,188.39 = 272.31/x
  3. Step 3: Cross multiply
    792.57x = 1,188.39 × 272.31
  4. Step 4: Simplify right side
    792.57x = 323,610.48
  5. Step 5: Solve for x
    x = 323,610.48/792.57
  6. Step 6: Final answer
    x = 408.31

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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.