Home / 1,821.34-2,512.47-1,378.48

Finding the Fourth Proportional to 1,821.34, 2,512.47 and 1,378.48

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Solution

The fourth proportional to 1,821.34, 2,512.47 and 1,378.48 is: 1,901.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,821.34 : 2,512.47 = 1,378.48 : x
  2. Step 2: Convert to fraction form
    1,821.34/2,512.47 = 1,378.48/x
  3. Step 3: Cross multiply
    1,821.34x = 2,512.47 × 1,378.48
  4. Step 4: Simplify right side
    1,821.34x = 3,463,389.65
  5. Step 5: Solve for x
    x = 3,463,389.65/1,821.34
  6. Step 6: Final answer
    x = 1,901.56

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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.