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Finding the Fourth Proportional to 961.44, 1,440.80 and 744

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Solution

The fourth proportional to 961.44, 1,440.80 and 744 is: 1,114.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.44 : 1,440.80 = 744 : x
  2. Step 2: Convert to fraction form
    961.44/1,440.80 = 744/x
  3. Step 3: Cross multiply
    961.44x = 1,440.80 × 744
  4. Step 4: Simplify right side
    961.44x = 1,071,955.20
  5. Step 5: Solve for x
    x = 1,071,955.20/961.44
  6. Step 6: Final answer
    x = 1,114.95

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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.