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Finding the Fourth Proportional to 1,219.15, 1,682.78 and 998.63

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Solution

The fourth proportional to 1,219.15, 1,682.78 and 998.63 is: 1,378.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.15 : 1,682.78 = 998.63 : x
  2. Step 2: Convert to fraction form
    1,219.15/1,682.78 = 998.63/x
  3. Step 3: Cross multiply
    1,219.15x = 1,682.78 × 998.63
  4. Step 4: Simplify right side
    1,219.15x = 1,680,467.49
  5. Step 5: Solve for x
    x = 1,680,467.49/1,219.15
  6. Step 6: Final answer
    x = 1,378.39

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.