Home / 1,976.40-2,728-1,387.08

Finding the Fourth Proportional to 1,976.40, 2,728 and 1,387.08

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Solution

The fourth proportional to 1,976.40, 2,728 and 1,387.08 is: 1,914.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,976.40 : 2,728 = 1,387.08 : x
  2. Step 2: Convert to fraction form
    1,976.40/2,728 = 1,387.08/x
  3. Step 3: Cross multiply
    1,976.40x = 2,728 × 1,387.08
  4. Step 4: Simplify right side
    1,976.40x = 3,783,954.24
  5. Step 5: Solve for x
    x = 3,783,954.24/1,976.40
  6. Step 6: Final answer
    x = 1,914.57

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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.