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Finding the Fourth Proportional to 788.78, 1,183.17 and 423.07

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Solution

The fourth proportional to 788.78, 1,183.17 and 423.07 is: 634.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.78 : 1,183.17 = 423.07 : x
  2. Step 2: Convert to fraction form
    788.78/1,183.17 = 423.07/x
  3. Step 3: Cross multiply
    788.78x = 1,183.17 × 423.07
  4. Step 4: Simplify right side
    788.78x = 500,560.77
  5. Step 5: Solve for x
    x = 500,560.77/788.78
  6. Step 6: Final answer
    x = 634.60

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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.