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Finding the Fourth Proportional to 788.74, 1,183.11 and 355.78

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Solution

The fourth proportional to 788.74, 1,183.11 and 355.78 is: 533.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.74 : 1,183.11 = 355.78 : x
  2. Step 2: Convert to fraction form
    788.74/1,183.11 = 355.78/x
  3. Step 3: Cross multiply
    788.74x = 1,183.11 × 355.78
  4. Step 4: Simplify right side
    788.74x = 420,926.88
  5. Step 5: Solve for x
    x = 420,926.88/788.74
  6. Step 6: Final answer
    x = 533.67

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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.