Home / 1,286.40-1,929.56-516.90

Finding the Fourth Proportional to 1,286.40, 1,929.56 and 516.90

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Solution

The fourth proportional to 1,286.40, 1,929.56 and 516.90 is: 775.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.40 : 1,929.56 = 516.90 : x
  2. Step 2: Convert to fraction form
    1,286.40/1,929.56 = 516.90/x
  3. Step 3: Cross multiply
    1,286.40x = 1,929.56 × 516.90
  4. Step 4: Simplify right side
    1,286.40x = 997,389.56
  5. Step 5: Solve for x
    x = 997,389.56/1,286.40
  6. Step 6: Final answer
    x = 775.33

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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.