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Finding the Fourth Proportional to 408.12, 612.48 and 316.59

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Solution

The fourth proportional to 408.12, 612.48 and 316.59 is: 475.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.12 : 612.48 = 316.59 : x
  2. Step 2: Convert to fraction form
    408.12/612.48 = 316.59/x
  3. Step 3: Cross multiply
    408.12x = 612.48 × 316.59
  4. Step 4: Simplify right side
    408.12x = 193,905.04
  5. Step 5: Solve for x
    x = 193,905.04/408.12
  6. Step 6: Final answer
    x = 475.12

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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.