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Finding the Fourth Proportional to 786.46, 1,179.75 and 231.21

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Solution

The fourth proportional to 786.46, 1,179.75 and 231.21 is: 346.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.46 : 1,179.75 = 231.21 : x
  2. Step 2: Convert to fraction form
    786.46/1,179.75 = 231.21/x
  3. Step 3: Cross multiply
    786.46x = 1,179.75 × 231.21
  4. Step 4: Simplify right side
    786.46x = 272,770.00
  5. Step 5: Solve for x
    x = 272,770.00/786.46
  6. Step 6: Final answer
    x = 346.83

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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.