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Finding the Fourth Proportional to 1,392.26, 2,089.07 and 661.64

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Solution

The fourth proportional to 1,392.26, 2,089.07 and 661.64 is: 992.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.26 : 2,089.07 = 661.64 : x
  2. Step 2: Convert to fraction form
    1,392.26/2,089.07 = 661.64/x
  3. Step 3: Cross multiply
    1,392.26x = 2,089.07 × 661.64
  4. Step 4: Simplify right side
    1,392.26x = 1,382,198.52
  5. Step 5: Solve for x
    x = 1,382,198.52/1,392.26
  6. Step 6: Final answer
    x = 992.78

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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.