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Finding the Fourth Proportional to 445.40, 668.09 and 137.28

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Solution

The fourth proportional to 445.40, 668.09 and 137.28 is: 205.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.40 : 668.09 = 137.28 : x
  2. Step 2: Convert to fraction form
    445.40/668.09 = 137.28/x
  3. Step 3: Cross multiply
    445.40x = 668.09 × 137.28
  4. Step 4: Simplify right side
    445.40x = 91,715.74
  5. Step 5: Solve for x
    x = 91,715.74/445.40
  6. Step 6: Final answer
    x = 205.92

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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.