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Finding the Fourth Proportional to 961.28, 1,324.80 and 739.84

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Solution

The fourth proportional to 961.28, 1,324.80 and 739.84 is: 1,019.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.28 : 1,324.80 = 739.84 : x
  2. Step 2: Convert to fraction form
    961.28/1,324.80 = 739.84/x
  3. Step 3: Cross multiply
    961.28x = 1,324.80 × 739.84
  4. Step 4: Simplify right side
    961.28x = 980,140.03
  5. Step 5: Solve for x
    x = 980,140.03/961.28
  6. Step 6: Final answer
    x = 1,019.62

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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.