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Finding the Fourth Proportional to 3,162, 4,363.68 and 1,920

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Solution

The fourth proportional to 3,162, 4,363.68 and 1,920 is: 2,649.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,162 : 4,363.68 = 1,920 : x
  2. Step 2: Convert to fraction form
    3,162/4,363.68 = 1,920/x
  3. Step 3: Cross multiply
    3,162x = 4,363.68 × 1,920
  4. Step 4: Simplify right side
    3,162x = 8,378,265.60
  5. Step 5: Solve for x
    x = 8,378,265.60/3,162
  6. Step 6: Final answer
    x = 2,649.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.