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Finding the Fourth Proportional to 539.45, 808.92 and 210.54

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Solution

The fourth proportional to 539.45, 808.92 and 210.54 is: 315.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.45 : 808.92 = 210.54 : x
  2. Step 2: Convert to fraction form
    539.45/808.92 = 210.54/x
  3. Step 3: Cross multiply
    539.45x = 808.92 × 210.54
  4. Step 4: Simplify right side
    539.45x = 170,310.02
  5. Step 5: Solve for x
    x = 170,310.02/539.45
  6. Step 6: Final answer
    x = 315.71

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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.