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Finding the Fourth Proportional to 786.91, 1,083.47 and 668.65

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Solution

The fourth proportional to 786.91, 1,083.47 and 668.65 is: 920.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.91 : 1,083.47 = 668.65 : x
  2. Step 2: Convert to fraction form
    786.91/1,083.47 = 668.65/x
  3. Step 3: Cross multiply
    786.91x = 1,083.47 × 668.65
  4. Step 4: Simplify right side
    786.91x = 724,453.45
  5. Step 5: Solve for x
    x = 724,453.45/786.91
  6. Step 6: Final answer
    x = 920.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.