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Finding the Fourth Proportional to 816.02, 1,221.23 and 634.25

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Solution

The fourth proportional to 816.02, 1,221.23 and 634.25 is: 949.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.02 : 1,221.23 = 634.25 : x
  2. Step 2: Convert to fraction form
    816.02/1,221.23 = 634.25/x
  3. Step 3: Cross multiply
    816.02x = 1,221.23 × 634.25
  4. Step 4: Simplify right side
    816.02x = 774,560.61
  5. Step 5: Solve for x
    x = 774,560.61/816.02
  6. Step 6: Final answer
    x = 949.19

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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.