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Finding the Fourth Proportional to 465.43, 642.17 and 318.11

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Solution

The fourth proportional to 465.43, 642.17 and 318.11 is: 438.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.43 : 642.17 = 318.11 : x
  2. Step 2: Convert to fraction form
    465.43/642.17 = 318.11/x
  3. Step 3: Cross multiply
    465.43x = 642.17 × 318.11
  4. Step 4: Simplify right side
    465.43x = 204,283.10
  5. Step 5: Solve for x
    x = 204,283.10/465.43
  6. Step 6: Final answer
    x = 438.91

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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.