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Finding the Fourth Proportional to 671.22, 999.80 and 662.82

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Solution

The fourth proportional to 671.22, 999.80 and 662.82 is: 987.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.22 : 999.80 = 662.82 : x
  2. Step 2: Convert to fraction form
    671.22/999.80 = 662.82/x
  3. Step 3: Cross multiply
    671.22x = 999.80 × 662.82
  4. Step 4: Simplify right side
    671.22x = 662,684.12
  5. Step 5: Solve for x
    x = 662,684.12/671.22
  6. Step 6: Final answer
    x = 987.28

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.