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Finding the Fourth Proportional to 775.62, 1,068.78 and 720.94

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Solution

The fourth proportional to 775.62, 1,068.78 and 720.94 is: 993.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.62 : 1,068.78 = 720.94 : x
  2. Step 2: Convert to fraction form
    775.62/1,068.78 = 720.94/x
  3. Step 3: Cross multiply
    775.62x = 1,068.78 × 720.94
  4. Step 4: Simplify right side
    775.62x = 770,526.25
  5. Step 5: Solve for x
    x = 770,526.25/775.62
  6. Step 6: Final answer
    x = 993.43

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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.