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Finding the Fourth Proportional to 1,015.68, 1,399.96 and 683.96

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Solution

The fourth proportional to 1,015.68, 1,399.96 and 683.96 is: 942.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.68 : 1,399.96 = 683.96 : x
  2. Step 2: Convert to fraction form
    1,015.68/1,399.96 = 683.96/x
  3. Step 3: Cross multiply
    1,015.68x = 1,399.96 × 683.96
  4. Step 4: Simplify right side
    1,015.68x = 957,516.64
  5. Step 5: Solve for x
    x = 957,516.64/1,015.68
  6. Step 6: Final answer
    x = 942.73

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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.