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Finding the Fourth Proportional to 965.43, 1,331.91 and 611.28

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Solution

The fourth proportional to 965.43, 1,331.91 and 611.28 is: 843.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.43 : 1,331.91 = 611.28 : x
  2. Step 2: Convert to fraction form
    965.43/1,331.91 = 611.28/x
  3. Step 3: Cross multiply
    965.43x = 1,331.91 × 611.28
  4. Step 4: Simplify right side
    965.43x = 814,169.94
  5. Step 5: Solve for x
    x = 814,169.94/965.43
  6. Step 6: Final answer
    x = 843.32

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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.