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Finding the Fourth Proportional to 1,791.44, 2,686.80 and 636.56

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Solution

The fourth proportional to 1,791.44, 2,686.80 and 636.56 is: 954.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,791.44 : 2,686.80 = 636.56 : x
  2. Step 2: Convert to fraction form
    1,791.44/2,686.80 = 636.56/x
  3. Step 3: Cross multiply
    1,791.44x = 2,686.80 × 636.56
  4. Step 4: Simplify right side
    1,791.44x = 1,710,309.41
  5. Step 5: Solve for x
    x = 1,710,309.41/1,791.44
  6. Step 6: Final answer
    x = 954.71

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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.