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Finding the Fourth Proportional to 519.48, 779.20 and 129.47

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Solution

The fourth proportional to 519.48, 779.20 and 129.47 is: 194.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.48 : 779.20 = 129.47 : x
  2. Step 2: Convert to fraction form
    519.48/779.20 = 129.47/x
  3. Step 3: Cross multiply
    519.48x = 779.20 × 129.47
  4. Step 4: Simplify right side
    519.48x = 100,883.02
  5. Step 5: Solve for x
    x = 100,883.02/519.48
  6. Step 6: Final answer
    x = 194.20

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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.