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Finding the Fourth Proportional to 408.68, 615.79 and 338.12

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Solution

The fourth proportional to 408.68, 615.79 and 338.12 is: 509.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.68 : 615.79 = 338.12 : x
  2. Step 2: Convert to fraction form
    408.68/615.79 = 338.12/x
  3. Step 3: Cross multiply
    408.68x = 615.79 × 338.12
  4. Step 4: Simplify right side
    408.68x = 208,210.91
  5. Step 5: Solve for x
    x = 208,210.91/408.68
  6. Step 6: Final answer
    x = 509.47

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.