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Finding the Fourth Proportional to 762.85, 1,143.63 and 329.68

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Solution

The fourth proportional to 762.85, 1,143.63 and 329.68 is: 494.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.85 : 1,143.63 = 329.68 : x
  2. Step 2: Convert to fraction form
    762.85/1,143.63 = 329.68/x
  3. Step 3: Cross multiply
    762.85x = 1,143.63 × 329.68
  4. Step 4: Simplify right side
    762.85x = 377,031.94
  5. Step 5: Solve for x
    x = 377,031.94/762.85
  6. Step 6: Final answer
    x = 494.24

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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.