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Finding the Fourth Proportional to 736.72, 1,105 and 389.92

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Solution

The fourth proportional to 736.72, 1,105 and 389.92 is: 584.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    736.72 : 1,105 = 389.92 : x
  2. Step 2: Convert to fraction form
    736.72/1,105 = 389.92/x
  3. Step 3: Cross multiply
    736.72x = 1,105 × 389.92
  4. Step 4: Simplify right side
    736.72x = 430,861.60
  5. Step 5: Solve for x
    x = 430,861.60/736.72
  6. Step 6: Final answer
    x = 584.84

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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.