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Finding the Fourth Proportional to 409.70, 615.16 and 328.30

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Solution

The fourth proportional to 409.70, 615.16 and 328.30 is: 492.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.70 : 615.16 = 328.30 : x
  2. Step 2: Convert to fraction form
    409.70/615.16 = 328.30/x
  3. Step 3: Cross multiply
    409.70x = 615.16 × 328.30
  4. Step 4: Simplify right side
    409.70x = 201,957.03
  5. Step 5: Solve for x
    x = 201,957.03/409.70
  6. Step 6: Final answer
    x = 492.94

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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.