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Finding the Fourth Proportional to 438.22, 605.28 and 328.19

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Solution

The fourth proportional to 438.22, 605.28 and 328.19 is: 453.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.22 : 605.28 = 328.19 : x
  2. Step 2: Convert to fraction form
    438.22/605.28 = 328.19/x
  3. Step 3: Cross multiply
    438.22x = 605.28 × 328.19
  4. Step 4: Simplify right side
    438.22x = 198,646.84
  5. Step 5: Solve for x
    x = 198,646.84/438.22
  6. Step 6: Final answer
    x = 453.30

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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.