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Finding the Fourth Proportional to 1,661.89, 2,290.90 and 1,366.65

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Solution

The fourth proportional to 1,661.89, 2,290.90 and 1,366.65 is: 1,883.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,661.89 : 2,290.90 = 1,366.65 : x
  2. Step 2: Convert to fraction form
    1,661.89/2,290.90 = 1,366.65/x
  3. Step 3: Cross multiply
    1,661.89x = 2,290.90 × 1,366.65
  4. Step 4: Simplify right side
    1,661.89x = 3,130,858.49
  5. Step 5: Solve for x
    x = 3,130,858.49/1,661.89
  6. Step 6: Final answer
    x = 1,883.91

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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.