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Finding the Fourth Proportional to 788.60, 1,183.38 and 326.60

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Solution

The fourth proportional to 788.60, 1,183.38 and 326.60 is: 490.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.60 : 1,183.38 = 326.60 : x
  2. Step 2: Convert to fraction form
    788.60/1,183.38 = 326.60/x
  3. Step 3: Cross multiply
    788.60x = 1,183.38 × 326.60
  4. Step 4: Simplify right side
    788.60x = 386,491.91
  5. Step 5: Solve for x
    x = 386,491.91/788.60
  6. Step 6: Final answer
    x = 490.10

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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.