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Finding the Fourth Proportional to 1,338.02, 2,007.61 and 516.87

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Solution

The fourth proportional to 1,338.02, 2,007.61 and 516.87 is: 775.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,338.02 : 2,007.61 = 516.87 : x
  2. Step 2: Convert to fraction form
    1,338.02/2,007.61 = 516.87/x
  3. Step 3: Cross multiply
    1,338.02x = 2,007.61 × 516.87
  4. Step 4: Simplify right side
    1,338.02x = 1,037,681.56
  5. Step 5: Solve for x
    x = 1,037,681.56/1,338.02
  6. Step 6: Final answer
    x = 775.53

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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.