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Finding the Fourth Proportional to 515.69, 773.81 and 320.79

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Solution

The fourth proportional to 515.69, 773.81 and 320.79 is: 481.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.69 : 773.81 = 320.79 : x
  2. Step 2: Convert to fraction form
    515.69/773.81 = 320.79/x
  3. Step 3: Cross multiply
    515.69x = 773.81 × 320.79
  4. Step 4: Simplify right side
    515.69x = 248,230.51
  5. Step 5: Solve for x
    x = 248,230.51/515.69
  6. Step 6: Final answer
    x = 481.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.