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Finding the Fourth Proportional to 965.72, 1,448.34 and 811.76

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Solution

The fourth proportional to 965.72, 1,448.34 and 811.76 is: 1,217.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.72 : 1,448.34 = 811.76 : x
  2. Step 2: Convert to fraction form
    965.72/1,448.34 = 811.76/x
  3. Step 3: Cross multiply
    965.72x = 1,448.34 × 811.76
  4. Step 4: Simplify right side
    965.72x = 1,175,704.48
  5. Step 5: Solve for x
    x = 1,175,704.48/965.72
  6. Step 6: Final answer
    x = 1,217.44

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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.