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Finding the Fourth Proportional to 270.92, 407.20 and 206.12

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Solution

The fourth proportional to 270.92, 407.20 and 206.12 is: 309.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    270.92 : 407.20 = 206.12 : x
  2. Step 2: Convert to fraction form
    270.92/407.20 = 206.12/x
  3. Step 3: Cross multiply
    270.92x = 407.20 × 206.12
  4. Step 4: Simplify right side
    270.92x = 83,932.06
  5. Step 5: Solve for x
    x = 83,932.06/270.92
  6. Step 6: Final answer
    x = 309.80

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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.