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Finding the Fourth Proportional to 622.20, 851.91 and 622.20

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Solution

The fourth proportional to 622.20, 851.91 and 622.20 is: 851.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.20 : 851.91 = 622.20 : x
  2. Step 2: Convert to fraction form
    622.20/851.91 = 622.20/x
  3. Step 3: Cross multiply
    622.20x = 851.91 × 622.20
  4. Step 4: Simplify right side
    622.20x = 530,058.40
  5. Step 5: Solve for x
    x = 530,058.40/622.20
  6. Step 6: Final answer
    x = 851.91

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.