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Finding the Fourth Proportional to 776.85, 1,072.16 and 445.29

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Solution

The fourth proportional to 776.85, 1,072.16 and 445.29 is: 614.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.85 : 1,072.16 = 445.29 : x
  2. Step 2: Convert to fraction form
    776.85/1,072.16 = 445.29/x
  3. Step 3: Cross multiply
    776.85x = 1,072.16 × 445.29
  4. Step 4: Simplify right side
    776.85x = 477,419.90
  5. Step 5: Solve for x
    x = 477,419.90/776.85
  6. Step 6: Final answer
    x = 614.56

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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.