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Finding the Fourth Proportional to 1,338.65, 2,006.56 and 516.57

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Solution

The fourth proportional to 1,338.65, 2,006.56 and 516.57 is: 774.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,338.65 : 2,006.56 = 516.57 : x
  2. Step 2: Convert to fraction form
    1,338.65/2,006.56 = 516.57/x
  3. Step 3: Cross multiply
    1,338.65x = 2,006.56 × 516.57
  4. Step 4: Simplify right side
    1,338.65x = 1,036,528.70
  5. Step 5: Solve for x
    x = 1,036,528.70/1,338.65
  6. Step 6: Final answer
    x = 774.31

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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.