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Finding the Fourth Proportional to 465.46, 642.26 and 318.44

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Solution

The fourth proportional to 465.46, 642.26 and 318.44 is: 439.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.46 : 642.26 = 318.44 : x
  2. Step 2: Convert to fraction form
    465.46/642.26 = 318.44/x
  3. Step 3: Cross multiply
    465.46x = 642.26 × 318.44
  4. Step 4: Simplify right side
    465.46x = 204,521.27
  5. Step 5: Solve for x
    x = 204,521.27/465.46
  6. Step 6: Final answer
    x = 439.40

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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.