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Finding the Fourth Proportional to 788.85, 1,183.28 and 423.81

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Solution

The fourth proportional to 788.85, 1,183.28 and 423.81 is: 635.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.85 : 1,183.28 = 423.81 : x
  2. Step 2: Convert to fraction form
    788.85/1,183.28 = 423.81/x
  3. Step 3: Cross multiply
    788.85x = 1,183.28 × 423.81
  4. Step 4: Simplify right side
    788.85x = 501,483.78
  5. Step 5: Solve for x
    x = 501,483.78/788.85
  6. Step 6: Final answer
    x = 635.72

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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.