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Finding the Fourth Proportional to 786.39, 1,179.36 and 323.70

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Solution

The fourth proportional to 786.39, 1,179.36 and 323.70 is: 485.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.39 : 1,179.36 = 323.70 : x
  2. Step 2: Convert to fraction form
    786.39/1,179.36 = 323.70/x
  3. Step 3: Cross multiply
    786.39x = 1,179.36 × 323.70
  4. Step 4: Simplify right side
    786.39x = 381,758.83
  5. Step 5: Solve for x
    x = 381,758.83/786.39
  6. Step 6: Final answer
    x = 485.46

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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.