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Finding the Fourth Proportional to 1,176.67, 1,764.64 and 813.79

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Solution

The fourth proportional to 1,176.67, 1,764.64 and 813.79 is: 1,220.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,176.67 : 1,764.64 = 813.79 : x
  2. Step 2: Convert to fraction form
    1,176.67/1,764.64 = 813.79/x
  3. Step 3: Cross multiply
    1,176.67x = 1,764.64 × 813.79
  4. Step 4: Simplify right side
    1,176.67x = 1,436,046.39
  5. Step 5: Solve for x
    x = 1,436,046.39/1,176.67
  6. Step 6: Final answer
    x = 1,220.43

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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.