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Finding the Fourth Proportional to 1,991.25, 2,987.25 and 951.33

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Solution

The fourth proportional to 1,991.25, 2,987.25 and 951.33 is: 1,427.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.25 : 2,987.25 = 951.33 : x
  2. Step 2: Convert to fraction form
    1,991.25/2,987.25 = 951.33/x
  3. Step 3: Cross multiply
    1,991.25x = 2,987.25 × 951.33
  4. Step 4: Simplify right side
    1,991.25x = 2,841,860.54
  5. Step 5: Solve for x
    x = 2,841,860.54/1,991.25
  6. Step 6: Final answer
    x = 1,427.17

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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.