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Finding the Fourth Proportional to 515.39, 771.32 and 439.24

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Solution

The fourth proportional to 515.39, 771.32 and 439.24 is: 657.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.39 : 771.32 = 439.24 : x
  2. Step 2: Convert to fraction form
    515.39/771.32 = 439.24/x
  3. Step 3: Cross multiply
    515.39x = 771.32 × 439.24
  4. Step 4: Simplify right side
    515.39x = 338,794.06
  5. Step 5: Solve for x
    x = 338,794.06/515.39
  6. Step 6: Final answer
    x = 657.36

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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.