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Finding the Fourth Proportional to 1,422.14, 1,963.79 and 891.93

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Solution

The fourth proportional to 1,422.14, 1,963.79 and 891.93 is: 1,231.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,422.14 : 1,963.79 = 891.93 : x
  2. Step 2: Convert to fraction form
    1,422.14/1,963.79 = 891.93/x
  3. Step 3: Cross multiply
    1,422.14x = 1,963.79 × 891.93
  4. Step 4: Simplify right side
    1,422.14x = 1,751,563.21
  5. Step 5: Solve for x
    x = 1,751,563.21/1,422.14
  6. Step 6: Final answer
    x = 1,231.64

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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.