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Finding the Fourth Proportional to 994.35, 1,371.29 and 621.21

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Solution

The fourth proportional to 994.35, 1,371.29 and 621.21 is: 856.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.35 : 1,371.29 = 621.21 : x
  2. Step 2: Convert to fraction form
    994.35/1,371.29 = 621.21/x
  3. Step 3: Cross multiply
    994.35x = 1,371.29 × 621.21
  4. Step 4: Simplify right side
    994.35x = 851,855.95
  5. Step 5: Solve for x
    x = 851,855.95/994.35
  6. Step 6: Final answer
    x = 856.70

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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.