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Finding the Fourth Proportional to 408.30, 611.87 and 316.57

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Solution

The fourth proportional to 408.30, 611.87 and 316.57 is: 474.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.30 : 611.87 = 316.57 : x
  2. Step 2: Convert to fraction form
    408.30/611.87 = 316.57/x
  3. Step 3: Cross multiply
    408.30x = 611.87 × 316.57
  4. Step 4: Simplify right side
    408.30x = 193,695.04
  5. Step 5: Solve for x
    x = 193,695.04/408.30
  6. Step 6: Final answer
    x = 474.40

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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.