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Finding the Fourth Proportional to 1,537.63, 2,121.92 and 839

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Solution

The fourth proportional to 1,537.63, 2,121.92 and 839 is: 1,157.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,537.63 : 2,121.92 = 839 : x
  2. Step 2: Convert to fraction form
    1,537.63/2,121.92 = 839/x
  3. Step 3: Cross multiply
    1,537.63x = 2,121.92 × 839
  4. Step 4: Simplify right side
    1,537.63x = 1,780,290.88
  5. Step 5: Solve for x
    x = 1,780,290.88/1,537.63
  6. Step 6: Final answer
    x = 1,157.81

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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.