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Finding the Fourth Proportional to 1,928.31, 2,891.37 and 611.82

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Solution

The fourth proportional to 1,928.31, 2,891.37 and 611.82 is: 917.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,928.31 : 2,891.37 = 611.82 : x
  2. Step 2: Convert to fraction form
    1,928.31/2,891.37 = 611.82/x
  3. Step 3: Cross multiply
    1,928.31x = 2,891.37 × 611.82
  4. Step 4: Simplify right side
    1,928.31x = 1,768,983.54
  5. Step 5: Solve for x
    x = 1,768,983.54/1,928.31
  6. Step 6: Final answer
    x = 917.38

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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.