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Finding the Fourth Proportional to 465.89, 642.96 and 318.72

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Solution

The fourth proportional to 465.89, 642.96 and 318.72 is: 439.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.89 : 642.96 = 318.72 : x
  2. Step 2: Convert to fraction form
    465.89/642.96 = 318.72/x
  3. Step 3: Cross multiply
    465.89x = 642.96 × 318.72
  4. Step 4: Simplify right side
    465.89x = 204,924.21
  5. Step 5: Solve for x
    x = 204,924.21/465.89
  6. Step 6: Final answer
    x = 439.86

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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.