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Finding the Fourth Proportional to 1,394.78, 1,923.82 and 1,219.82

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Solution

The fourth proportional to 1,394.78, 1,923.82 and 1,219.82 is: 1,682.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,394.78 : 1,923.82 = 1,219.82 : x
  2. Step 2: Convert to fraction form
    1,394.78/1,923.82 = 1,219.82/x
  3. Step 3: Cross multiply
    1,394.78x = 1,923.82 × 1,219.82
  4. Step 4: Simplify right side
    1,394.78x = 2,346,701.44
  5. Step 5: Solve for x
    x = 2,346,701.44/1,394.78
  6. Step 6: Final answer
    x = 1,682.49

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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.