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Finding the Fourth Proportional to 961.30, 1,439.92 and 441.75

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Solution

The fourth proportional to 961.30, 1,439.92 and 441.75 is: 661.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.30 : 1,439.92 = 441.75 : x
  2. Step 2: Convert to fraction form
    961.30/1,439.92 = 441.75/x
  3. Step 3: Cross multiply
    961.30x = 1,439.92 × 441.75
  4. Step 4: Simplify right side
    961.30x = 636,084.66
  5. Step 5: Solve for x
    x = 636,084.66/961.30
  6. Step 6: Final answer
    x = 661.69

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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.