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Finding the Fourth Proportional to 411.80, 617.28 and 137.69

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Solution

The fourth proportional to 411.80, 617.28 and 137.69 is: 206.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.80 : 617.28 = 137.69 : x
  2. Step 2: Convert to fraction form
    411.80/617.28 = 137.69/x
  3. Step 3: Cross multiply
    411.80x = 617.28 × 137.69
  4. Step 4: Simplify right side
    411.80x = 84,990.20
  5. Step 5: Solve for x
    x = 84,990.20/411.80
  6. Step 6: Final answer
    x = 206.39

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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.