Home / 2,818.49-3,890.43-1,979.40

Finding the Fourth Proportional to 2,818.49, 3,890.43 and 1,979.40

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Solution

The fourth proportional to 2,818.49, 3,890.43 and 1,979.40 is: 2,732.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,818.49 : 3,890.43 = 1,979.40 : x
  2. Step 2: Convert to fraction form
    2,818.49/3,890.43 = 1,979.40/x
  3. Step 3: Cross multiply
    2,818.49x = 3,890.43 × 1,979.40
  4. Step 4: Simplify right side
    2,818.49x = 7,700,717.14
  5. Step 5: Solve for x
    x = 7,700,717.14/2,818.49
  6. Step 6: Final answer
    x = 2,732.21

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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.