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Finding the Fourth Proportional to 1,308.88, 1,963.88 and 443.28

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Solution

The fourth proportional to 1,308.88, 1,963.88 and 443.28 is: 665.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.88 : 1,963.88 = 443.28 : x
  2. Step 2: Convert to fraction form
    1,308.88/1,963.88 = 443.28/x
  3. Step 3: Cross multiply
    1,308.88x = 1,963.88 × 443.28
  4. Step 4: Simplify right side
    1,308.88x = 870,548.73
  5. Step 5: Solve for x
    x = 870,548.73/1,308.88
  6. Step 6: Final answer
    x = 665.11

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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.