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Finding the Fourth Proportional to 1,013.44, 1,398.16 and 620.44

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Solution

The fourth proportional to 1,013.44, 1,398.16 and 620.44 is: 855.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.44 : 1,398.16 = 620.44 : x
  2. Step 2: Convert to fraction form
    1,013.44/1,398.16 = 620.44/x
  3. Step 3: Cross multiply
    1,013.44x = 1,398.16 × 620.44
  4. Step 4: Simplify right side
    1,013.44x = 867,474.39
  5. Step 5: Solve for x
    x = 867,474.39/1,013.44
  6. Step 6: Final answer
    x = 855.97

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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.