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Finding the Fourth Proportional to 786.79, 1,181.09 and 422.29

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Solution

The fourth proportional to 786.79, 1,181.09 and 422.29 is: 633.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.79 : 1,181.09 = 422.29 : x
  2. Step 2: Convert to fraction form
    786.79/1,181.09 = 422.29/x
  3. Step 3: Cross multiply
    786.79x = 1,181.09 × 422.29
  4. Step 4: Simplify right side
    786.79x = 498,760.60
  5. Step 5: Solve for x
    x = 498,760.60/786.79
  6. Step 6: Final answer
    x = 633.92

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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.