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Finding the Fourth Proportional to 519.69, 779.43 and 259.59

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Solution

The fourth proportional to 519.69, 779.43 and 259.59 is: 389.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.69 : 779.43 = 259.59 : x
  2. Step 2: Convert to fraction form
    519.69/779.43 = 259.59/x
  3. Step 3: Cross multiply
    519.69x = 779.43 × 259.59
  4. Step 4: Simplify right side
    519.69x = 202,332.23
  5. Step 5: Solve for x
    x = 202,332.23/519.69
  6. Step 6: Final answer
    x = 389.33

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Double scale
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1.5x scale

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.