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Finding the Fourth Proportional to 674.05, 930.31 and 643.27

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Solution

The fourth proportional to 674.05, 930.31 and 643.27 is: 887.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.05 : 930.31 = 643.27 : x
  2. Step 2: Convert to fraction form
    674.05/930.31 = 643.27/x
  3. Step 3: Cross multiply
    674.05x = 930.31 × 643.27
  4. Step 4: Simplify right side
    674.05x = 598,444.45
  5. Step 5: Solve for x
    x = 598,444.45/674.05
  6. Step 6: Final answer
    x = 887.83

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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.