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Finding the Fourth Proportional to 994.08, 1,372.20 and 621

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Solution

The fourth proportional to 994.08, 1,372.20 and 621 is: 857.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.08 : 1,372.20 = 621 : x
  2. Step 2: Convert to fraction form
    994.08/1,372.20 = 621/x
  3. Step 3: Cross multiply
    994.08x = 1,372.20 × 621
  4. Step 4: Simplify right side
    994.08x = 852,136.20
  5. Step 5: Solve for x
    x = 852,136.20/994.08
  6. Step 6: Final answer
    x = 857.21

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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.