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Finding the Fourth Proportional to 776.92, 1,072.04 and 445.28

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Solution

The fourth proportional to 776.92, 1,072.04 and 445.28 is: 614.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.92 : 1,072.04 = 445.28 : x
  2. Step 2: Convert to fraction form
    776.92/1,072.04 = 445.28/x
  3. Step 3: Cross multiply
    776.92x = 1,072.04 × 445.28
  4. Step 4: Simplify right side
    776.92x = 477,357.97
  5. Step 5: Solve for x
    x = 477,357.97/776.92
  6. Step 6: Final answer
    x = 614.42

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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.