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Finding the Fourth Proportional to 465.89, 642.24 and 318.29

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Solution

The fourth proportional to 465.89, 642.24 and 318.29 is: 438.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.89 : 642.24 = 318.29 : x
  2. Step 2: Convert to fraction form
    465.89/642.24 = 318.29/x
  3. Step 3: Cross multiply
    465.89x = 642.24 × 318.29
  4. Step 4: Simplify right side
    465.89x = 204,415.36
  5. Step 5: Solve for x
    x = 204,415.36/465.89
  6. Step 6: Final answer
    x = 438.77

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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.