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Finding the Fourth Proportional to 408.68, 612.70 and 305.96

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Solution

The fourth proportional to 408.68, 612.70 and 305.96 is: 458.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.68 : 612.70 = 305.96 : x
  2. Step 2: Convert to fraction form
    408.68/612.70 = 305.96/x
  3. Step 3: Cross multiply
    408.68x = 612.70 × 305.96
  4. Step 4: Simplify right side
    408.68x = 187,461.69
  5. Step 5: Solve for x
    x = 187,461.69/408.68
  6. Step 6: Final answer
    x = 458.70

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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.