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Finding the Fourth Proportional to 1,638.89, 2,261.63 and 940.22

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Solution

The fourth proportional to 1,638.89, 2,261.63 and 940.22 is: 1,297.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.89 : 2,261.63 = 940.22 : x
  2. Step 2: Convert to fraction form
    1,638.89/2,261.63 = 940.22/x
  3. Step 3: Cross multiply
    1,638.89x = 2,261.63 × 940.22
  4. Step 4: Simplify right side
    1,638.89x = 2,126,413.75
  5. Step 5: Solve for x
    x = 2,126,413.75/1,638.89
  6. Step 6: Final answer
    x = 1,297.48

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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.