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Finding the Fourth Proportional to 448.54, 671.90 and 217.28

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Solution

The fourth proportional to 448.54, 671.90 and 217.28 is: 325.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.54 : 671.90 = 217.28 : x
  2. Step 2: Convert to fraction form
    448.54/671.90 = 217.28/x
  3. Step 3: Cross multiply
    448.54x = 671.90 × 217.28
  4. Step 4: Simplify right side
    448.54x = 145,991.03
  5. Step 5: Solve for x
    x = 145,991.03/448.54
  6. Step 6: Final answer
    x = 325.48

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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.