Home / 1,386.28-2,079.49-412.39

Finding the Fourth Proportional to 1,386.28, 2,079.49 and 412.39

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Solution

The fourth proportional to 1,386.28, 2,079.49 and 412.39 is: 618.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.28 : 2,079.49 = 412.39 : x
  2. Step 2: Convert to fraction form
    1,386.28/2,079.49 = 412.39/x
  3. Step 3: Cross multiply
    1,386.28x = 2,079.49 × 412.39
  4. Step 4: Simplify right side
    1,386.28x = 857,563.22
  5. Step 5: Solve for x
    x = 857,563.22/1,386.28
  6. Step 6: Final answer
    x = 618.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.