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Finding the Fourth Proportional to 354.39, 531.38 and 137.71

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Solution

The fourth proportional to 354.39, 531.38 and 137.71 is: 206.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.39 : 531.38 = 137.71 : x
  2. Step 2: Convert to fraction form
    354.39/531.38 = 137.71/x
  3. Step 3: Cross multiply
    354.39x = 531.38 × 137.71
  4. Step 4: Simplify right side
    354.39x = 73,176.98
  5. Step 5: Solve for x
    x = 73,176.98/354.39
  6. Step 6: Final answer
    x = 206.49

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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.