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Finding the Fourth Proportional to 776.13, 1,071.57 and 481.83

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Solution

The fourth proportional to 776.13, 1,071.57 and 481.83 is: 665.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.13 : 1,071.57 = 481.83 : x
  2. Step 2: Convert to fraction form
    776.13/1,071.57 = 481.83/x
  3. Step 3: Cross multiply
    776.13x = 1,071.57 × 481.83
  4. Step 4: Simplify right side
    776.13x = 516,314.57
  5. Step 5: Solve for x
    x = 516,314.57/776.13
  6. Step 6: Final answer
    x = 665.24

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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.