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Finding the Fourth Proportional to 458.69, 687.22 and 328.48

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Solution

The fourth proportional to 458.69, 687.22 and 328.48 is: 492.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.69 : 687.22 = 328.48 : x
  2. Step 2: Convert to fraction form
    458.69/687.22 = 328.48/x
  3. Step 3: Cross multiply
    458.69x = 687.22 × 328.48
  4. Step 4: Simplify right side
    458.69x = 225,735.49
  5. Step 5: Solve for x
    x = 225,735.49/458.69
  6. Step 6: Final answer
    x = 492.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.