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Finding the Fourth Proportional to 736.20, 1,103.90 and 388.67

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Solution

The fourth proportional to 736.20, 1,103.90 and 388.67 is: 582.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    736.20 : 1,103.90 = 388.67 : x
  2. Step 2: Convert to fraction form
    736.20/1,103.90 = 388.67/x
  3. Step 3: Cross multiply
    736.20x = 1,103.90 × 388.67
  4. Step 4: Simplify right side
    736.20x = 429,045.35
  5. Step 5: Solve for x
    x = 429,045.35/736.20
  6. Step 6: Final answer
    x = 582.78

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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.