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Finding the Fourth Proportional to 782.94, 1,174.86 and 320.79

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Solution

The fourth proportional to 782.94, 1,174.86 and 320.79 is: 481.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.94 : 1,174.86 = 320.79 : x
  2. Step 2: Convert to fraction form
    782.94/1,174.86 = 320.79/x
  3. Step 3: Cross multiply
    782.94x = 1,174.86 × 320.79
  4. Step 4: Simplify right side
    782.94x = 376,883.34
  5. Step 5: Solve for x
    x = 376,883.34/782.94
  6. Step 6: Final answer
    x = 481.37

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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.