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Finding the Fourth Proportional to 776.94, 1,072.29 and 445.50

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Solution

The fourth proportional to 776.94, 1,072.29 and 445.50 is: 614.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.94 : 1,072.29 = 445.50 : x
  2. Step 2: Convert to fraction form
    776.94/1,072.29 = 445.50/x
  3. Step 3: Cross multiply
    776.94x = 1,072.29 × 445.50
  4. Step 4: Simplify right side
    776.94x = 477,704.36
  5. Step 5: Solve for x
    x = 477,704.36/776.94
  6. Step 6: Final answer
    x = 614.85

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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.