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Finding the Fourth Proportional to 519.57, 779.34 and 129.57

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Solution

The fourth proportional to 519.57, 779.34 and 129.57 is: 194.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.57 : 779.34 = 129.57 : x
  2. Step 2: Convert to fraction form
    519.57/779.34 = 129.57/x
  3. Step 3: Cross multiply
    519.57x = 779.34 × 129.57
  4. Step 4: Simplify right side
    519.57x = 100,979.08
  5. Step 5: Solve for x
    x = 100,979.08/519.57
  6. Step 6: Final answer
    x = 194.35

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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.