Home / 1,399.26-1,928.20-999.80

Finding the Fourth Proportional to 1,399.26, 1,928.20 and 999.80

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Solution

The fourth proportional to 1,399.26, 1,928.20 and 999.80 is: 1,377.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,399.26 : 1,928.20 = 999.80 : x
  2. Step 2: Convert to fraction form
    1,399.26/1,928.20 = 999.80/x
  3. Step 3: Cross multiply
    1,399.26x = 1,928.20 × 999.80
  4. Step 4: Simplify right side
    1,399.26x = 1,927,814.36
  5. Step 5: Solve for x
    x = 1,927,814.36/1,399.26
  6. Step 6: Final answer
    x = 1,377.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.