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Finding the Fourth Proportional to 792.60, 1,186.86 and 517.88

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Solution

The fourth proportional to 792.60, 1,186.86 and 517.88 is: 775.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.60 : 1,186.86 = 517.88 : x
  2. Step 2: Convert to fraction form
    792.60/1,186.86 = 517.88/x
  3. Step 3: Cross multiply
    792.60x = 1,186.86 × 517.88
  4. Step 4: Simplify right side
    792.60x = 614,651.06
  5. Step 5: Solve for x
    x = 614,651.06/792.60
  6. Step 6: Final answer
    x = 775.49

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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.