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Finding the Fourth Proportional to 782.88, 1,170.54 and 668.67

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Solution

The fourth proportional to 782.88, 1,170.54 and 668.67 is: 999.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.88 : 1,170.54 = 668.67 : x
  2. Step 2: Convert to fraction form
    782.88/1,170.54 = 668.67/x
  3. Step 3: Cross multiply
    782.88x = 1,170.54 × 668.67
  4. Step 4: Simplify right side
    782.88x = 782,704.98
  5. Step 5: Solve for x
    x = 782,704.98/782.88
  6. Step 6: Final answer
    x = 999.78

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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.