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Finding the Fourth Proportional to 667, 919.12 and 664.44

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Solution

The fourth proportional to 667, 919.12 and 664.44 is: 915.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    667 : 919.12 = 664.44 : x
  2. Step 2: Convert to fraction form
    667/919.12 = 664.44/x
  3. Step 3: Cross multiply
    667x = 919.12 × 664.44
  4. Step 4: Simplify right side
    667x = 610,700.09
  5. Step 5: Solve for x
    x = 610,700.09/667
  6. Step 6: Final answer
    x = 915.59

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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.