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Finding the Fourth Proportional to 775.85, 1,161.36 and 665.12

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Solution

The fourth proportional to 775.85, 1,161.36 and 665.12 is: 995.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.85 : 1,161.36 = 665.12 : x
  2. Step 2: Convert to fraction form
    775.85/1,161.36 = 665.12/x
  3. Step 3: Cross multiply
    775.85x = 1,161.36 × 665.12
  4. Step 4: Simplify right side
    775.85x = 772,446.67
  5. Step 5: Solve for x
    x = 772,446.67/775.85
  6. Step 6: Final answer
    x = 995.62

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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.