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Finding the Fourth Proportional to 965.75, 1,447.87 and 445.38

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Solution

The fourth proportional to 965.75, 1,447.87 and 445.38 is: 667.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.75 : 1,447.87 = 445.38 : x
  2. Step 2: Convert to fraction form
    965.75/1,447.87 = 445.38/x
  3. Step 3: Cross multiply
    965.75x = 1,447.87 × 445.38
  4. Step 4: Simplify right side
    965.75x = 644,852.34
  5. Step 5: Solve for x
    x = 644,852.34/965.75
  6. Step 6: Final answer
    x = 667.72

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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.