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Finding the Fourth Proportional to 354.22, 531.48 and 137.86

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Solution

The fourth proportional to 354.22, 531.48 and 137.86 is: 206.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.22 : 531.48 = 137.86 : x
  2. Step 2: Convert to fraction form
    354.22/531.48 = 137.86/x
  3. Step 3: Cross multiply
    354.22x = 531.48 × 137.86
  4. Step 4: Simplify right side
    354.22x = 73,269.83
  5. Step 5: Solve for x
    x = 73,269.83/354.22
  6. Step 6: Final answer
    x = 206.85

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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.