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Finding the Fourth Proportional to 939.01, 1,294.96 and 644.37

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Solution

The fourth proportional to 939.01, 1,294.96 and 644.37 is: 888.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.01 : 1,294.96 = 644.37 : x
  2. Step 2: Convert to fraction form
    939.01/1,294.96 = 644.37/x
  3. Step 3: Cross multiply
    939.01x = 1,294.96 × 644.37
  4. Step 4: Simplify right side
    939.01x = 834,433.38
  5. Step 5: Solve for x
    x = 834,433.38/939.01
  6. Step 6: Final answer
    x = 888.63

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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.