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Finding the Fourth Proportional to 776.75, 1,072.13 and 481.86

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Solution

The fourth proportional to 776.75, 1,072.13 and 481.86 is: 665.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.75 : 1,072.13 = 481.86 : x
  2. Step 2: Convert to fraction form
    776.75/1,072.13 = 481.86/x
  3. Step 3: Cross multiply
    776.75x = 1,072.13 × 481.86
  4. Step 4: Simplify right side
    776.75x = 516,614.15
  5. Step 5: Solve for x
    x = 516,614.15/776.75
  6. Step 6: Final answer
    x = 665.10

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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.