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Finding the Fourth Proportional to 1,187.87, 1,639.13 and 683.78

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Solution

The fourth proportional to 1,187.87, 1,639.13 and 683.78 is: 943.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.87 : 1,639.13 = 683.78 : x
  2. Step 2: Convert to fraction form
    1,187.87/1,639.13 = 683.78/x
  3. Step 3: Cross multiply
    1,187.87x = 1,639.13 × 683.78
  4. Step 4: Simplify right side
    1,187.87x = 1,120,792.70
  5. Step 5: Solve for x
    x = 1,120,792.70/1,187.87
  6. Step 6: Final answer
    x = 943.54

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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.