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Finding the Fourth Proportional to 408.20, 612.33 and 340.21

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Solution

The fourth proportional to 408.20, 612.33 and 340.21 is: 510.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.20 : 612.33 = 340.21 : x
  2. Step 2: Convert to fraction form
    408.20/612.33 = 340.21/x
  3. Step 3: Cross multiply
    408.20x = 612.33 × 340.21
  4. Step 4: Simplify right side
    408.20x = 208,316.03
  5. Step 5: Solve for x
    x = 208,316.03/408.20
  6. Step 6: Final answer
    x = 510.33

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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.