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Finding the Fourth Proportional to 776.86, 1,072.08 and 445.31

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Solution

The fourth proportional to 776.86, 1,072.08 and 445.31 is: 614.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.86 : 1,072.08 = 445.31 : x
  2. Step 2: Convert to fraction form
    776.86/1,072.08 = 445.31/x
  3. Step 3: Cross multiply
    776.86x = 1,072.08 × 445.31
  4. Step 4: Simplify right side
    776.86x = 477,407.94
  5. Step 5: Solve for x
    x = 477,407.94/776.86
  6. Step 6: Final answer
    x = 614.54

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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.