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Finding the Fourth Proportional to 776.56, 1,071.64 and 481.76

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Solution

The fourth proportional to 776.56, 1,071.64 and 481.76 is: 664.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.56 : 1,071.64 = 481.76 : x
  2. Step 2: Convert to fraction form
    776.56/1,071.64 = 481.76/x
  3. Step 3: Cross multiply
    776.56x = 1,071.64 × 481.76
  4. Step 4: Simplify right side
    776.56x = 516,273.29
  5. Step 5: Solve for x
    x = 516,273.29/776.56
  6. Step 6: Final answer
    x = 664.82

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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.