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Finding the Fourth Proportional to 354.05, 531.30 and 191.78

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Solution

The fourth proportional to 354.05, 531.30 and 191.78 is: 287.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.05 : 531.30 = 191.78 : x
  2. Step 2: Convert to fraction form
    354.05/531.30 = 191.78/x
  3. Step 3: Cross multiply
    354.05x = 531.30 × 191.78
  4. Step 4: Simplify right side
    354.05x = 101,892.71
  5. Step 5: Solve for x
    x = 101,892.71/354.05
  6. Step 6: Final answer
    x = 287.79

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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.