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Finding the Fourth Proportional to 787.96, 1,183.31 and 423.02

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Solution

The fourth proportional to 787.96, 1,183.31 and 423.02 is: 635.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.96 : 1,183.31 = 423.02 : x
  2. Step 2: Convert to fraction form
    787.96/1,183.31 = 423.02/x
  3. Step 3: Cross multiply
    787.96x = 1,183.31 × 423.02
  4. Step 4: Simplify right side
    787.96x = 500,566.23
  5. Step 5: Solve for x
    x = 500,566.23/787.96
  6. Step 6: Final answer
    x = 635.27

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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.