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Finding the Fourth Proportional to 862.66, 1,287.73 and 798.42

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Solution

The fourth proportional to 862.66, 1,287.73 and 798.42 is: 1,191.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.66 : 1,287.73 = 798.42 : x
  2. Step 2: Convert to fraction form
    862.66/1,287.73 = 798.42/x
  3. Step 3: Cross multiply
    862.66x = 1,287.73 × 798.42
  4. Step 4: Simplify right side
    862.66x = 1,028,149.39
  5. Step 5: Solve for x
    x = 1,028,149.39/862.66
  6. Step 6: Final answer
    x = 1,191.84

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.