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Finding the Fourth Proportional to 782.90, 1,173.33 and 678.41

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Solution

The fourth proportional to 782.90, 1,173.33 and 678.41 is: 1,016.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.90 : 1,173.33 = 678.41 : x
  2. Step 2: Convert to fraction form
    782.90/1,173.33 = 678.41/x
  3. Step 3: Cross multiply
    782.90x = 1,173.33 × 678.41
  4. Step 4: Simplify right side
    782.90x = 795,992.94
  5. Step 5: Solve for x
    x = 795,992.94/782.90
  6. Step 6: Final answer
    x = 1,016.73

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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.