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Finding the Fourth Proportional to 993.11, 1,369.44 and 638.33

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Solution

The fourth proportional to 993.11, 1,369.44 and 638.33 is: 880.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.11 : 1,369.44 = 638.33 : x
  2. Step 2: Convert to fraction form
    993.11/1,369.44 = 638.33/x
  3. Step 3: Cross multiply
    993.11x = 1,369.44 × 638.33
  4. Step 4: Simplify right side
    993.11x = 874,147.79
  5. Step 5: Solve for x
    x = 874,147.79/993.11
  6. Step 6: Final answer
    x = 880.22

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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.