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Finding the Fourth Proportional to 792.21, 1,188.38 and 207.21

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Solution

The fourth proportional to 792.21, 1,188.38 and 207.21 is: 310.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.21 : 1,188.38 = 207.21 : x
  2. Step 2: Convert to fraction form
    792.21/1,188.38 = 207.21/x
  3. Step 3: Cross multiply
    792.21x = 1,188.38 × 207.21
  4. Step 4: Simplify right side
    792.21x = 246,244.22
  5. Step 5: Solve for x
    x = 246,244.22/792.21
  6. Step 6: Final answer
    x = 310.83

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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.