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Finding the Fourth Proportional to 775.21, 1,162.15 and 255.08

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Solution

The fourth proportional to 775.21, 1,162.15 and 255.08 is: 382.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.21 : 1,162.15 = 255.08 : x
  2. Step 2: Convert to fraction form
    775.21/1,162.15 = 255.08/x
  3. Step 3: Cross multiply
    775.21x = 1,162.15 × 255.08
  4. Step 4: Simplify right side
    775.21x = 296,436.05
  5. Step 5: Solve for x
    x = 296,436.05/775.21
  6. Step 6: Final answer
    x = 382.39

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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.