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Finding the Fourth Proportional to 2,155.44, 3,231.04 and 693.62

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Solution

The fourth proportional to 2,155.44, 3,231.04 and 693.62 is: 1,039.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,155.44 : 3,231.04 = 693.62 : x
  2. Step 2: Convert to fraction form
    2,155.44/3,231.04 = 693.62/x
  3. Step 3: Cross multiply
    2,155.44x = 3,231.04 × 693.62
  4. Step 4: Simplify right side
    2,155.44x = 2,241,113.96
  5. Step 5: Solve for x
    x = 2,241,113.96/2,155.44
  6. Step 6: Final answer
    x = 1,039.75

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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.