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Finding the Fourth Proportional to 465.75, 643.28 and 318.13

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Solution

The fourth proportional to 465.75, 643.28 and 318.13 is: 439.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.75 : 643.28 = 318.13 : x
  2. Step 2: Convert to fraction form
    465.75/643.28 = 318.13/x
  3. Step 3: Cross multiply
    465.75x = 643.28 × 318.13
  4. Step 4: Simplify right side
    465.75x = 204,643.47
  5. Step 5: Solve for x
    x = 204,643.47/465.75
  6. Step 6: Final answer
    x = 439.38

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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.