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Finding the Fourth Proportional to 354.15, 531.54 and 189.75

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Solution

The fourth proportional to 354.15, 531.54 and 189.75 is: 284.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.15 : 531.54 = 189.75 : x
  2. Step 2: Convert to fraction form
    354.15/531.54 = 189.75/x
  3. Step 3: Cross multiply
    354.15x = 531.54 × 189.75
  4. Step 4: Simplify right side
    354.15x = 100,859.72
  5. Step 5: Solve for x
    x = 100,859.72/354.15
  6. Step 6: Final answer
    x = 284.79

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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.