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Finding the Fourth Proportional to 786.79, 1,084.71 and 550.42

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Solution

The fourth proportional to 786.79, 1,084.71 and 550.42 is: 758.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.79 : 1,084.71 = 550.42 : x
  2. Step 2: Convert to fraction form
    786.79/1,084.71 = 550.42/x
  3. Step 3: Cross multiply
    786.79x = 1,084.71 × 550.42
  4. Step 4: Simplify right side
    786.79x = 597,046.08
  5. Step 5: Solve for x
    x = 597,046.08/786.79
  6. Step 6: Final answer
    x = 758.84

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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.