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Finding the Fourth Proportional to 519.89, 779.87 and 149.71

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Solution

The fourth proportional to 519.89, 779.87 and 149.71 is: 224.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.89 : 779.87 = 149.71 : x
  2. Step 2: Convert to fraction form
    519.89/779.87 = 149.71/x
  3. Step 3: Cross multiply
    519.89x = 779.87 × 149.71
  4. Step 4: Simplify right side
    519.89x = 116,752.76
  5. Step 5: Solve for x
    x = 116,752.76/519.89
  6. Step 6: Final answer
    x = 224.57

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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.