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Finding the Fourth Proportional to 1,853.81, 2,781.08 and 621.33

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Solution

The fourth proportional to 1,853.81, 2,781.08 and 621.33 is: 932.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,853.81 : 2,781.08 = 621.33 : x
  2. Step 2: Convert to fraction form
    1,853.81/2,781.08 = 621.33/x
  3. Step 3: Cross multiply
    1,853.81x = 2,781.08 × 621.33
  4. Step 4: Simplify right side
    1,853.81x = 1,727,968.44
  5. Step 5: Solve for x
    x = 1,727,968.44/1,853.81
  6. Step 6: Final answer
    x = 932.12

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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.