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Finding the Fourth Proportional to 1,212.87, 1,818 and 519.84

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Solution

The fourth proportional to 1,212.87, 1,818 and 519.84 is: 779.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.87 : 1,818 = 519.84 : x
  2. Step 2: Convert to fraction form
    1,212.87/1,818 = 519.84/x
  3. Step 3: Cross multiply
    1,212.87x = 1,818 × 519.84
  4. Step 4: Simplify right side
    1,212.87x = 945,069.12
  5. Step 5: Solve for x
    x = 945,069.12/1,212.87
  6. Step 6: Final answer
    x = 779.20

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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.