Home / 2,989.68-4,128-1,812.36

Finding the Fourth Proportional to 2,989.68, 4,128 and 1,812.36

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Solution

The fourth proportional to 2,989.68, 4,128 and 1,812.36 is: 2,502.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,989.68 : 4,128 = 1,812.36 : x
  2. Step 2: Convert to fraction form
    2,989.68/4,128 = 1,812.36/x
  3. Step 3: Cross multiply
    2,989.68x = 4,128 × 1,812.36
  4. Step 4: Simplify right side
    2,989.68x = 7,481,422.08
  5. Step 5: Solve for x
    x = 7,481,422.08/2,989.68
  6. Step 6: Final answer
    x = 2,502.42

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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.