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Finding the Fourth Proportional to 721.21, 993.30 and 622.93

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Solution

The fourth proportional to 721.21, 993.30 and 622.93 is: 857.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.21 : 993.30 = 622.93 : x
  2. Step 2: Convert to fraction form
    721.21/993.30 = 622.93/x
  3. Step 3: Cross multiply
    721.21x = 993.30 × 622.93
  4. Step 4: Simplify right side
    721.21x = 618,756.37
  5. Step 5: Solve for x
    x = 618,756.37/721.21
  6. Step 6: Final answer
    x = 857.94

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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.