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Finding the Fourth Proportional to 804.87, 1,208 and 318.27

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Solution

The fourth proportional to 804.87, 1,208 and 318.27 is: 477.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.87 : 1,208 = 318.27 : x
  2. Step 2: Convert to fraction form
    804.87/1,208 = 318.27/x
  3. Step 3: Cross multiply
    804.87x = 1,208 × 318.27
  4. Step 4: Simplify right side
    804.87x = 384,470.16
  5. Step 5: Solve for x
    x = 384,470.16/804.87
  6. Step 6: Final answer
    x = 477.68

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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.