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Finding the Fourth Proportional to 782.75, 1,174.43 and 320.75

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Solution

The fourth proportional to 782.75, 1,174.43 and 320.75 is: 481.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.75 : 1,174.43 = 320.75 : x
  2. Step 2: Convert to fraction form
    782.75/1,174.43 = 320.75/x
  3. Step 3: Cross multiply
    782.75x = 1,174.43 × 320.75
  4. Step 4: Simplify right side
    782.75x = 376,697.76
  5. Step 5: Solve for x
    x = 376,697.76/782.75
  6. Step 6: Final answer
    x = 481.25

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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.