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Finding the Fourth Proportional to 996.63, 1,375.05 and 775.20

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Solution

The fourth proportional to 996.63, 1,375.05 and 775.20 is: 1,069.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.63 : 1,375.05 = 775.20 : x
  2. Step 2: Convert to fraction form
    996.63/1,375.05 = 775.20/x
  3. Step 3: Cross multiply
    996.63x = 1,375.05 × 775.20
  4. Step 4: Simplify right side
    996.63x = 1,065,938.76
  5. Step 5: Solve for x
    x = 1,065,938.76/996.63
  6. Step 6: Final answer
    x = 1,069.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.