Home / 1,386.39-1,912.17-1,106.28

Finding the Fourth Proportional to 1,386.39, 1,912.17 and 1,106.28

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Solution

The fourth proportional to 1,386.39, 1,912.17 and 1,106.28 is: 1,525.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.39 : 1,912.17 = 1,106.28 : x
  2. Step 2: Convert to fraction form
    1,386.39/1,912.17 = 1,106.28/x
  3. Step 3: Cross multiply
    1,386.39x = 1,912.17 × 1,106.28
  4. Step 4: Simplify right side
    1,386.39x = 2,115,395.43
  5. Step 5: Solve for x
    x = 2,115,395.43/1,386.39
  6. Step 6: Final answer
    x = 1,525.83

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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.