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Finding the Fourth Proportional to 1,291.44, 1,782.73 and 872.36

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Solution

The fourth proportional to 1,291.44, 1,782.73 and 872.36 is: 1,204.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.44 : 1,782.73 = 872.36 : x
  2. Step 2: Convert to fraction form
    1,291.44/1,782.73 = 872.36/x
  3. Step 3: Cross multiply
    1,291.44x = 1,782.73 × 872.36
  4. Step 4: Simplify right side
    1,291.44x = 1,555,182.34
  5. Step 5: Solve for x
    x = 1,555,182.34/1,291.44
  6. Step 6: Final answer
    x = 1,204.22

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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.