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Finding the Fourth Proportional to 776.12, 1,071.11 and 461.48

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Solution

The fourth proportional to 776.12, 1,071.11 and 461.48 is: 636.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.12 : 1,071.11 = 461.48 : x
  2. Step 2: Convert to fraction form
    776.12/1,071.11 = 461.48/x
  3. Step 3: Cross multiply
    776.12x = 1,071.11 × 461.48
  4. Step 4: Simplify right side
    776.12x = 494,293.54
  5. Step 5: Solve for x
    x = 494,293.54/776.12
  6. Step 6: Final answer
    x = 636.88

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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.