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Finding the Fourth Proportional to 1,619.12, 2,428.92 and 838

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Solution

The fourth proportional to 1,619.12, 2,428.92 and 838 is: 1,257.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,619.12 : 2,428.92 = 838 : x
  2. Step 2: Convert to fraction form
    1,619.12/2,428.92 = 838/x
  3. Step 3: Cross multiply
    1,619.12x = 2,428.92 × 838
  4. Step 4: Simplify right side
    1,619.12x = 2,035,434.96
  5. Step 5: Solve for x
    x = 2,035,434.96/1,619.12
  6. Step 6: Final answer
    x = 1,257.12

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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.