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Finding the Fourth Proportional to 354.11, 531.17 and 137.64

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Solution

The fourth proportional to 354.11, 531.17 and 137.64 is: 206.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.11 : 531.17 = 137.64 : x
  2. Step 2: Convert to fraction form
    354.11/531.17 = 137.64/x
  3. Step 3: Cross multiply
    354.11x = 531.17 × 137.64
  4. Step 4: Simplify right side
    354.11x = 73,109.55
  5. Step 5: Solve for x
    x = 73,109.55/354.11
  6. Step 6: Final answer
    x = 206.46

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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.