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Finding the Fourth Proportional to 913.43, 1,369.79 and 328.25

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Solution

The fourth proportional to 913.43, 1,369.79 and 328.25 is: 492.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.43 : 1,369.79 = 328.25 : x
  2. Step 2: Convert to fraction form
    913.43/1,369.79 = 328.25/x
  3. Step 3: Cross multiply
    913.43x = 1,369.79 × 328.25
  4. Step 4: Simplify right side
    913.43x = 449,625.08
  5. Step 5: Solve for x
    x = 449,625.08/913.43
  6. Step 6: Final answer
    x = 492.24

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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.