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Finding the Fourth Proportional to 409.49, 615.65 and 328.89

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Solution

The fourth proportional to 409.49, 615.65 and 328.89 is: 494.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.49 : 615.65 = 328.89 : x
  2. Step 2: Convert to fraction form
    409.49/615.65 = 328.89/x
  3. Step 3: Cross multiply
    409.49x = 615.65 × 328.89
  4. Step 4: Simplify right side
    409.49x = 202,479.48
  5. Step 5: Solve for x
    x = 202,479.48/409.49
  6. Step 6: Final answer
    x = 494.47

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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.