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Finding the Fourth Proportional to 667.70, 1,003.71 and 664.46

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Solution

The fourth proportional to 667.70, 1,003.71 and 664.46 is: 998.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.70 : 1,003.71 = 664.46 : x
  2. Step 2: Convert to fraction form
    667.70/1,003.71 = 664.46/x
  3. Step 3: Cross multiply
    667.70x = 1,003.71 × 664.46
  4. Step 4: Simplify right side
    667.70x = 666,925.15
  5. Step 5: Solve for x
    x = 666,925.15/667.70
  6. Step 6: Final answer
    x = 998.84

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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.