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Finding the Fourth Proportional to 2,155.76, 3,234.56 and 923.44

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Solution

The fourth proportional to 2,155.76, 3,234.56 and 923.44 is: 1,385.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,155.76 : 3,234.56 = 923.44 : x
  2. Step 2: Convert to fraction form
    2,155.76/3,234.56 = 923.44/x
  3. Step 3: Cross multiply
    2,155.76x = 3,234.56 × 923.44
  4. Step 4: Simplify right side
    2,155.76x = 2,986,922.09
  5. Step 5: Solve for x
    x = 2,986,922.09/2,155.76
  6. Step 6: Final answer
    x = 1,385.55

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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.