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Finding the Fourth Proportional to 662.22, 999.32 and 641.70

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Solution

The fourth proportional to 662.22, 999.32 and 641.70 is: 968.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.22 : 999.32 = 641.70 : x
  2. Step 2: Convert to fraction form
    662.22/999.32 = 641.70/x
  3. Step 3: Cross multiply
    662.22x = 999.32 × 641.70
  4. Step 4: Simplify right side
    662.22x = 641,260.44
  5. Step 5: Solve for x
    x = 641,260.44/662.22
  6. Step 6: Final answer
    x = 968.35

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.