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Finding the Fourth Proportional to 2,121.79, 3,182.69 and 661.03

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Solution

The fourth proportional to 2,121.79, 3,182.69 and 661.03 is: 991.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.79 : 3,182.69 = 661.03 : x
  2. Step 2: Convert to fraction form
    2,121.79/3,182.69 = 661.03/x
  3. Step 3: Cross multiply
    2,121.79x = 3,182.69 × 661.03
  4. Step 4: Simplify right side
    2,121.79x = 2,103,853.57
  5. Step 5: Solve for x
    x = 2,103,853.57/2,121.79
  6. Step 6: Final answer
    x = 991.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.