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Finding the Fourth Proportional to 775.90, 1,161.41 and 441.91

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Solution

The fourth proportional to 775.90, 1,161.41 and 441.91 is: 661.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.90 : 1,161.41 = 441.91 : x
  2. Step 2: Convert to fraction form
    775.90/1,161.41 = 441.91/x
  3. Step 3: Cross multiply
    775.90x = 1,161.41 × 441.91
  4. Step 4: Simplify right side
    775.90x = 513,238.69
  5. Step 5: Solve for x
    x = 513,238.69/775.90
  6. Step 6: Final answer
    x = 661.48

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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.