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Finding the Fourth Proportional to 519.31, 779.32 and 389.41

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Solution

The fourth proportional to 519.31, 779.32 and 389.41 is: 584.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.31 : 779.32 = 389.41 : x
  2. Step 2: Convert to fraction form
    519.31/779.32 = 389.41/x
  3. Step 3: Cross multiply
    519.31x = 779.32 × 389.41
  4. Step 4: Simplify right side
    519.31x = 303,473.54
  5. Step 5: Solve for x
    x = 303,473.54/519.31
  6. Step 6: Final answer
    x = 584.38

Related Problems

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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.