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Finding the Fourth Proportional to 1,661.36, 2,291.90 and 997.06

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Solution

The fourth proportional to 1,661.36, 2,291.90 and 997.06 is: 1,375.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,661.36 : 2,291.90 = 997.06 : x
  2. Step 2: Convert to fraction form
    1,661.36/2,291.90 = 997.06/x
  3. Step 3: Cross multiply
    1,661.36x = 2,291.90 × 997.06
  4. Step 4: Simplify right side
    1,661.36x = 2,285,161.81
  5. Step 5: Solve for x
    x = 2,285,161.81/1,661.36
  6. Step 6: Final answer
    x = 1,375.48

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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.