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Finding the Fourth Proportional to 786.06, 1,179.09 and 439.23

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Solution

The fourth proportional to 786.06, 1,179.09 and 439.23 is: 658.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.06 : 1,179.09 = 439.23 : x
  2. Step 2: Convert to fraction form
    786.06/1,179.09 = 439.23/x
  3. Step 3: Cross multiply
    786.06x = 1,179.09 × 439.23
  4. Step 4: Simplify right side
    786.06x = 517,891.70
  5. Step 5: Solve for x
    x = 517,891.70/786.06
  6. Step 6: Final answer
    x = 658.85

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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.