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Finding the Fourth Proportional to 1,853.96, 2,781.39 and 621.38

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Solution

The fourth proportional to 1,853.96, 2,781.39 and 621.38 is: 932.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,853.96 : 2,781.39 = 621.38 : x
  2. Step 2: Convert to fraction form
    1,853.96/2,781.39 = 621.38/x
  3. Step 3: Cross multiply
    1,853.96x = 2,781.39 × 621.38
  4. Step 4: Simplify right side
    1,853.96x = 1,728,300.12
  5. Step 5: Solve for x
    x = 1,728,300.12/1,853.96
  6. Step 6: Final answer
    x = 932.22

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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.