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Finding the Fourth Proportional to 1,386.83, 1,912.27 and 1,133.97

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Solution

The fourth proportional to 1,386.83, 1,912.27 and 1,133.97 is: 1,563.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.83 : 1,912.27 = 1,133.97 : x
  2. Step 2: Convert to fraction form
    1,386.83/1,912.27 = 1,133.97/x
  3. Step 3: Cross multiply
    1,386.83x = 1,912.27 × 1,133.97
  4. Step 4: Simplify right side
    1,386.83x = 2,168,456.81
  5. Step 5: Solve for x
    x = 2,168,456.81/1,386.83
  6. Step 6: Final answer
    x = 1,563.61

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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.