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Finding the Fourth Proportional to 1,308.56, 1,963.92 and 921.38

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Solution

The fourth proportional to 1,308.56, 1,963.92 and 921.38 is: 1,382.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.56 : 1,963.92 = 921.38 : x
  2. Step 2: Convert to fraction form
    1,308.56/1,963.92 = 921.38/x
  3. Step 3: Cross multiply
    1,308.56x = 1,963.92 × 921.38
  4. Step 4: Simplify right side
    1,308.56x = 1,809,516.61
  5. Step 5: Solve for x
    x = 1,809,516.61/1,308.56
  6. Step 6: Final answer
    x = 1,382.83

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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.