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Finding the Fourth Proportional to 789.64, 1,087.26 and 671.38

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Solution

The fourth proportional to 789.64, 1,087.26 and 671.38 is: 924.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.64 : 1,087.26 = 671.38 : x
  2. Step 2: Convert to fraction form
    789.64/1,087.26 = 671.38/x
  3. Step 3: Cross multiply
    789.64x = 1,087.26 × 671.38
  4. Step 4: Simplify right side
    789.64x = 729,964.62
  5. Step 5: Solve for x
    x = 729,964.62/789.64
  6. Step 6: Final answer
    x = 924.43

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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.