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Finding the Fourth Proportional to 804.38, 1,205.85 and 414.17

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Solution

The fourth proportional to 804.38, 1,205.85 and 414.17 is: 620.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.38 : 1,205.85 = 414.17 : x
  2. Step 2: Convert to fraction form
    804.38/1,205.85 = 414.17/x
  3. Step 3: Cross multiply
    804.38x = 1,205.85 × 414.17
  4. Step 4: Simplify right side
    804.38x = 499,420.87
  5. Step 5: Solve for x
    x = 499,420.87/804.38
  6. Step 6: Final answer
    x = 620.88

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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.