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Finding the Fourth Proportional to 409.88, 615.02 and 217.50

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Solution

The fourth proportional to 409.88, 615.02 and 217.50 is: 326.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.88 : 615.02 = 217.50 : x
  2. Step 2: Convert to fraction form
    409.88/615.02 = 217.50/x
  3. Step 3: Cross multiply
    409.88x = 615.02 × 217.50
  4. Step 4: Simplify right side
    409.88x = 133,765.76
  5. Step 5: Solve for x
    x = 133,765.76/409.88
  6. Step 6: Final answer
    x = 326.36

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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.