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Finding the Fourth Proportional to 438.94, 605.64 and 328.51

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Solution

The fourth proportional to 438.94, 605.64 and 328.51 is: 453.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.94 : 605.64 = 328.51 : x
  2. Step 2: Convert to fraction form
    438.94/605.64 = 328.51/x
  3. Step 3: Cross multiply
    438.94x = 605.64 × 328.51
  4. Step 4: Simplify right side
    438.94x = 198,958.80
  5. Step 5: Solve for x
    x = 198,958.80/438.94
  6. Step 6: Final answer
    x = 453.27

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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.