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Finding the Fourth Proportional to 913.20, 1,369.71 and 328.17

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Solution

The fourth proportional to 913.20, 1,369.71 and 328.17 is: 492.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.20 : 1,369.71 = 328.17 : x
  2. Step 2: Convert to fraction form
    913.20/1,369.71 = 328.17/x
  3. Step 3: Cross multiply
    913.20x = 1,369.71 × 328.17
  4. Step 4: Simplify right side
    913.20x = 449,497.73
  5. Step 5: Solve for x
    x = 449,497.73/913.20
  6. Step 6: Final answer
    x = 492.22

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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.