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Finding the Fourth Proportional to 965.86, 1,331.56 and 611.60

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Solution

The fourth proportional to 965.86, 1,331.56 and 611.60 is: 843.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.86 : 1,331.56 = 611.60 : x
  2. Step 2: Convert to fraction form
    965.86/1,331.56 = 611.60/x
  3. Step 3: Cross multiply
    965.86x = 1,331.56 × 611.60
  4. Step 4: Simplify right side
    965.86x = 814,382.10
  5. Step 5: Solve for x
    x = 814,382.10/965.86
  6. Step 6: Final answer
    x = 843.17

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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.