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Finding the Fourth Proportional to 1,338.57, 2,006.42 and 516.60

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Solution

The fourth proportional to 1,338.57, 2,006.42 and 516.60 is: 774.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,338.57 : 2,006.42 = 516.60 : x
  2. Step 2: Convert to fraction form
    1,338.57/2,006.42 = 516.60/x
  3. Step 3: Cross multiply
    1,338.57x = 2,006.42 × 516.60
  4. Step 4: Simplify right side
    1,338.57x = 1,036,513.99
  5. Step 5: Solve for x
    x = 1,036,513.99/1,338.57
  6. Step 6: Final answer
    x = 774.34

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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.