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Finding the Fourth Proportional to 412.21, 617.93 and 206.47

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Solution

The fourth proportional to 412.21, 617.93 and 206.47 is: 309.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.21 : 617.93 = 206.47 : x
  2. Step 2: Convert to fraction form
    412.21/617.93 = 206.47/x
  3. Step 3: Cross multiply
    412.21x = 617.93 × 206.47
  4. Step 4: Simplify right side
    412.21x = 127,582.97
  5. Step 5: Solve for x
    x = 127,582.97/412.21
  6. Step 6: Final answer
    x = 309.51

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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.