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Finding the Fourth Proportional to 1,422.79, 1,964.07 and 863.44

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Solution

The fourth proportional to 1,422.79, 1,964.07 and 863.44 is: 1,191.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,422.79 : 1,964.07 = 863.44 : x
  2. Step 2: Convert to fraction form
    1,422.79/1,964.07 = 863.44/x
  3. Step 3: Cross multiply
    1,422.79x = 1,964.07 × 863.44
  4. Step 4: Simplify right side
    1,422.79x = 1,695,853.44
  5. Step 5: Solve for x
    x = 1,695,853.44/1,422.79
  6. Step 6: Final answer
    x = 1,191.92

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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.