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Finding the Fourth Proportional to 1,228.82, 1,698.09 and 968.90

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Solution

The fourth proportional to 1,228.82, 1,698.09 and 968.90 is: 1,338.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,228.82 : 1,698.09 = 968.90 : x
  2. Step 2: Convert to fraction form
    1,228.82/1,698.09 = 968.90/x
  3. Step 3: Cross multiply
    1,228.82x = 1,698.09 × 968.90
  4. Step 4: Simplify right side
    1,228.82x = 1,645,279.40
  5. Step 5: Solve for x
    x = 1,645,279.40/1,228.82
  6. Step 6: Final answer
    x = 1,338.91

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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.