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Finding the Fourth Proportional to 1,853.97, 2,781.09 and 621.39

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Solution

The fourth proportional to 1,853.97, 2,781.09 and 621.39 is: 932.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,853.97 : 2,781.09 = 621.39 : x
  2. Step 2: Convert to fraction form
    1,853.97/2,781.09 = 621.39/x
  3. Step 3: Cross multiply
    1,853.97x = 2,781.09 × 621.39
  4. Step 4: Simplify right side
    1,853.97x = 1,728,141.52
  5. Step 5: Solve for x
    x = 1,728,141.52/1,853.97
  6. Step 6: Final answer
    x = 932.13

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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.