Home / 1,247.28-1,869.62-629.69

Finding the Fourth Proportional to 1,247.28, 1,869.62 and 629.69

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Solution

The fourth proportional to 1,247.28, 1,869.62 and 629.69 is: 943.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.28 : 1,869.62 = 629.69 : x
  2. Step 2: Convert to fraction form
    1,247.28/1,869.62 = 629.69/x
  3. Step 3: Cross multiply
    1,247.28x = 1,869.62 × 629.69
  4. Step 4: Simplify right side
    1,247.28x = 1,177,268.52
  5. Step 5: Solve for x
    x = 1,177,268.52/1,247.28
  6. Step 6: Final answer
    x = 943.87

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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.