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Finding the Fourth Proportional to 963.92, 1,323.24 and 939.76

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Solution

The fourth proportional to 963.92, 1,323.24 and 939.76 is: 1,290.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.92 : 1,323.24 = 939.76 : x
  2. Step 2: Convert to fraction form
    963.92/1,323.24 = 939.76/x
  3. Step 3: Cross multiply
    963.92x = 1,323.24 × 939.76
  4. Step 4: Simplify right side
    963.92x = 1,243,528.02
  5. Step 5: Solve for x
    x = 1,243,528.02/963.92
  6. Step 6: Final answer
    x = 1,290.07

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.