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Finding the Fourth Proportional to 572.43, 857.89 and 259.85

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Solution

The fourth proportional to 572.43, 857.89 and 259.85 is: 389.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.43 : 857.89 = 259.85 : x
  2. Step 2: Convert to fraction form
    572.43/857.89 = 259.85/x
  3. Step 3: Cross multiply
    572.43x = 857.89 × 259.85
  4. Step 4: Simplify right side
    572.43x = 222,922.72
  5. Step 5: Solve for x
    x = 222,922.72/572.43
  6. Step 6: Final answer
    x = 389.43

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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.