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Finding the Fourth Proportional to 965.16, 1,447.62 and 445.20

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Solution

The fourth proportional to 965.16, 1,447.62 and 445.20 is: 667.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.16 : 1,447.62 = 445.20 : x
  2. Step 2: Convert to fraction form
    965.16/1,447.62 = 445.20/x
  3. Step 3: Cross multiply
    965.16x = 1,447.62 × 445.20
  4. Step 4: Simplify right side
    965.16x = 644,480.42
  5. Step 5: Solve for x
    x = 644,480.42/965.16
  6. Step 6: Final answer
    x = 667.74

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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.