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Finding the Fourth Proportional to 1,422.87, 2,133.71 and 838

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Solution

The fourth proportional to 1,422.87, 2,133.71 and 838 is: 1,256.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,422.87 : 2,133.71 = 838 : x
  2. Step 2: Convert to fraction form
    1,422.87/2,133.71 = 838/x
  3. Step 3: Cross multiply
    1,422.87x = 2,133.71 × 838
  4. Step 4: Simplify right side
    1,422.87x = 1,788,048.98
  5. Step 5: Solve for x
    x = 1,788,048.98/1,422.87
  6. Step 6: Final answer
    x = 1,256.65

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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.