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Finding the Fourth Proportional to 465.40, 642.54 and 318.34

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Solution

The fourth proportional to 465.40, 642.54 and 318.34 is: 439.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.40 : 642.54 = 318.34 : x
  2. Step 2: Convert to fraction form
    465.40/642.54 = 318.34/x
  3. Step 3: Cross multiply
    465.40x = 642.54 × 318.34
  4. Step 4: Simplify right side
    465.40x = 204,546.18
  5. Step 5: Solve for x
    x = 204,546.18/465.40
  6. Step 6: Final answer
    x = 439.51

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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.