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Finding the Fourth Proportional to 772.62, 1,064.64 and 717.94

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Solution

The fourth proportional to 772.62, 1,064.64 and 717.94 is: 989.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.62 : 1,064.64 = 717.94 : x
  2. Step 2: Convert to fraction form
    772.62/1,064.64 = 717.94/x
  3. Step 3: Cross multiply
    772.62x = 1,064.64 × 717.94
  4. Step 4: Simplify right side
    772.62x = 764,347.64
  5. Step 5: Solve for x
    x = 764,347.64/772.62
  6. Step 6: Final answer
    x = 989.29

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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.