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Finding the Fourth Proportional to 409.92, 615.23 and 318.80

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Solution

The fourth proportional to 409.92, 615.23 and 318.80 is: 478.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.92 : 615.23 = 318.80 : x
  2. Step 2: Convert to fraction form
    409.92/615.23 = 318.80/x
  3. Step 3: Cross multiply
    409.92x = 615.23 × 318.80
  4. Step 4: Simplify right side
    409.92x = 196,135.32
  5. Step 5: Solve for x
    x = 196,135.32/409.92
  6. Step 6: Final answer
    x = 478.47

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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.