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Finding the Fourth Proportional to 519.67, 779.50 and 129.66

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Solution

The fourth proportional to 519.67, 779.50 and 129.66 is: 194.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.67 : 779.50 = 129.66 : x
  2. Step 2: Convert to fraction form
    519.67/779.50 = 129.66/x
  3. Step 3: Cross multiply
    519.67x = 779.50 × 129.66
  4. Step 4: Simplify right side
    519.67x = 101,069.97
  5. Step 5: Solve for x
    x = 101,069.97/519.67
  6. Step 6: Final answer
    x = 194.49

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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.