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Finding the Fourth Proportional to 2,788.84, 4,183.69 and 939.81

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Solution

The fourth proportional to 2,788.84, 4,183.69 and 939.81 is: 1,409.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,788.84 : 4,183.69 = 939.81 : x
  2. Step 2: Convert to fraction form
    2,788.84/4,183.69 = 939.81/x
  3. Step 3: Cross multiply
    2,788.84x = 4,183.69 × 939.81
  4. Step 4: Simplify right side
    2,788.84x = 3,931,873.70
  5. Step 5: Solve for x
    x = 3,931,873.70/2,788.84
  6. Step 6: Final answer
    x = 1,409.86

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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.