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Finding the Fourth Proportional to 519.39, 779.49 and 357.39

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Solution

The fourth proportional to 519.39, 779.49 and 357.39 is: 536.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.39 : 779.49 = 357.39 : x
  2. Step 2: Convert to fraction form
    519.39/779.49 = 357.39/x
  3. Step 3: Cross multiply
    519.39x = 779.49 × 357.39
  4. Step 4: Simplify right side
    519.39x = 278,581.93
  5. Step 5: Solve for x
    x = 278,581.93/519.39
  6. Step 6: Final answer
    x = 536.36

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Double scale
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Similar ratio
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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.