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Finding the Fourth Proportional to 354.85, 531.43 and 208.28

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Solution

The fourth proportional to 354.85, 531.43 and 208.28 is: 311.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.85 : 531.43 = 208.28 : x
  2. Step 2: Convert to fraction form
    354.85/531.43 = 208.28/x
  3. Step 3: Cross multiply
    354.85x = 531.43 × 208.28
  4. Step 4: Simplify right side
    354.85x = 110,687.05
  5. Step 5: Solve for x
    x = 110,687.05/354.85
  6. Step 6: Final answer
    x = 311.93

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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.