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Finding the Fourth Proportional to 805.46, 1,208.21 and 318.24

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Solution

The fourth proportional to 805.46, 1,208.21 and 318.24 is: 477.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.46 : 1,208.21 = 318.24 : x
  2. Step 2: Convert to fraction form
    805.46/1,208.21 = 318.24/x
  3. Step 3: Cross multiply
    805.46x = 1,208.21 × 318.24
  4. Step 4: Simplify right side
    805.46x = 384,499.16
  5. Step 5: Solve for x
    x = 384,499.16/805.46
  6. Step 6: Final answer
    x = 477.37

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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.