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Finding the Fourth Proportional to 800, 1,103.98 and 450.66

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Solution

The fourth proportional to 800, 1,103.98 and 450.66 is: 621.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    800 : 1,103.98 = 450.66 : x
  2. Step 2: Convert to fraction form
    800/1,103.98 = 450.66/x
  3. Step 3: Cross multiply
    800x = 1,103.98 × 450.66
  4. Step 4: Simplify right side
    800x = 497,519.63
  5. Step 5: Solve for x
    x = 497,519.63/800
  6. Step 6: Final answer
    x = 621.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.