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Finding the Fourth Proportional to 519.73, 779.78 and 242.21

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Solution

The fourth proportional to 519.73, 779.78 and 242.21 is: 363.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.73 : 779.78 = 242.21 : x
  2. Step 2: Convert to fraction form
    519.73/779.78 = 242.21/x
  3. Step 3: Cross multiply
    519.73x = 779.78 × 242.21
  4. Step 4: Simplify right side
    519.73x = 188,870.51
  5. Step 5: Solve for x
    x = 188,870.51/519.73
  6. Step 6: Final answer
    x = 363.40

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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.