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Finding the Fourth Proportional to 800.27, 1,104.64 and 485.78

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Solution

The fourth proportional to 800.27, 1,104.64 and 485.78 is: 670.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.27 : 1,104.64 = 485.78 : x
  2. Step 2: Convert to fraction form
    800.27/1,104.64 = 485.78/x
  3. Step 3: Cross multiply
    800.27x = 1,104.64 × 485.78
  4. Step 4: Simplify right side
    800.27x = 536,613.57
  5. Step 5: Solve for x
    x = 536,613.57/800.27
  6. Step 6: Final answer
    x = 670.54

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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.