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Finding the Fourth Proportional to 1,291.80, 1,782.81 and 794.46

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Solution

The fourth proportional to 1,291.80, 1,782.81 and 794.46 is: 1,096.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.80 : 1,782.81 = 794.46 : x
  2. Step 2: Convert to fraction form
    1,291.80/1,782.81 = 794.46/x
  3. Step 3: Cross multiply
    1,291.80x = 1,782.81 × 794.46
  4. Step 4: Simplify right side
    1,291.80x = 1,416,371.23
  5. Step 5: Solve for x
    x = 1,416,371.23/1,291.80
  6. Step 6: Final answer
    x = 1,096.43

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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.