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Finding the Fourth Proportional to 439.82, 662.34 and 318.93

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Solution

The fourth proportional to 439.82, 662.34 and 318.93 is: 480.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.82 : 662.34 = 318.93 : x
  2. Step 2: Convert to fraction form
    439.82/662.34 = 318.93/x
  3. Step 3: Cross multiply
    439.82x = 662.34 × 318.93
  4. Step 4: Simplify right side
    439.82x = 211,240.10
  5. Step 5: Solve for x
    x = 211,240.10/439.82
  6. Step 6: Final answer
    x = 480.29

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.