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Finding the Fourth Proportional to 786.05, 1,179.09 and 439.19

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Solution

The fourth proportional to 786.05, 1,179.09 and 439.19 is: 658.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.05 : 1,179.09 = 439.19 : x
  2. Step 2: Convert to fraction form
    786.05/1,179.09 = 439.19/x
  3. Step 3: Cross multiply
    786.05x = 1,179.09 × 439.19
  4. Step 4: Simplify right side
    786.05x = 517,838.64
  5. Step 5: Solve for x
    x = 517,838.64/786.05
  6. Step 6: Final answer
    x = 658.79

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Double scale
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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.