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Finding the Fourth Proportional to 816.76, 1,222.29 and 668.80

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Solution

The fourth proportional to 816.76, 1,222.29 and 668.80 is: 1,000.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.76 : 1,222.29 = 668.80 : x
  2. Step 2: Convert to fraction form
    816.76/1,222.29 = 668.80/x
  3. Step 3: Cross multiply
    816.76x = 1,222.29 × 668.80
  4. Step 4: Simplify right side
    816.76x = 817,467.55
  5. Step 5: Solve for x
    x = 817,467.55/816.76
  6. Step 6: Final answer
    x = 1,000.87

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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.