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Finding the Fourth Proportional to 776.94, 1,072.20 and 445.38

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Solution

The fourth proportional to 776.94, 1,072.20 and 445.38 is: 614.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.94 : 1,072.20 = 445.38 : x
  2. Step 2: Convert to fraction form
    776.94/1,072.20 = 445.38/x
  3. Step 3: Cross multiply
    776.94x = 1,072.20 × 445.38
  4. Step 4: Simplify right side
    776.94x = 477,536.44
  5. Step 5: Solve for x
    x = 477,536.44/776.94
  6. Step 6: Final answer
    x = 614.64

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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.