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Finding the Fourth Proportional to 674.87, 931.44 and 644.09

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Solution

The fourth proportional to 674.87, 931.44 and 644.09 is: 888.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.87 : 931.44 = 644.09 : x
  2. Step 2: Convert to fraction form
    674.87/931.44 = 644.09/x
  3. Step 3: Cross multiply
    674.87x = 931.44 × 644.09
  4. Step 4: Simplify right side
    674.87x = 599,923.31
  5. Step 5: Solve for x
    x = 599,923.31/674.87
  6. Step 6: Final answer
    x = 888.95

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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.