Home / 1,386.16-2,079.28-412.27

Finding the Fourth Proportional to 1,386.16, 2,079.28 and 412.27

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Solution

The fourth proportional to 1,386.16, 2,079.28 and 412.27 is: 618.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.16 : 2,079.28 = 412.27 : x
  2. Step 2: Convert to fraction form
    1,386.16/2,079.28 = 412.27/x
  3. Step 3: Cross multiply
    1,386.16x = 2,079.28 × 412.27
  4. Step 4: Simplify right side
    1,386.16x = 857,222.70
  5. Step 5: Solve for x
    x = 857,222.70/1,386.16
  6. Step 6: Final answer
    x = 618.42

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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.