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Finding the Fourth Proportional to 776.55, 1,071.18 and 481.61

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Solution

The fourth proportional to 776.55, 1,071.18 and 481.61 is: 664.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.55 : 1,071.18 = 481.61 : x
  2. Step 2: Convert to fraction form
    776.55/1,071.18 = 481.61/x
  3. Step 3: Cross multiply
    776.55x = 1,071.18 × 481.61
  4. Step 4: Simplify right side
    776.55x = 515,885.64
  5. Step 5: Solve for x
    x = 515,885.64/776.55
  6. Step 6: Final answer
    x = 664.33

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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.