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Finding the Fourth Proportional to 961.28, 1,441.92 and 448

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Solution

The fourth proportional to 961.28, 1,441.92 and 448 is: 672

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.28 : 1,441.92 = 448 : x
  2. Step 2: Convert to fraction form
    961.28/1,441.92 = 448/x
  3. Step 3: Cross multiply
    961.28x = 1,441.92 × 448
  4. Step 4: Simplify right side
    961.28x = 645,980.16
  5. Step 5: Solve for x
    x = 645,980.16/961.28
  6. Step 6: Final answer
    x = 672

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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.