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Finding the Fourth Proportional to 572.05, 857.56 and 279.38

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Solution

The fourth proportional to 572.05, 857.56 and 279.38 is: 418.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.05 : 857.56 = 279.38 : x
  2. Step 2: Convert to fraction form
    572.05/857.56 = 279.38/x
  3. Step 3: Cross multiply
    572.05x = 857.56 × 279.38
  4. Step 4: Simplify right side
    572.05x = 239,586.56
  5. Step 5: Solve for x
    x = 239,586.56/572.05
  6. Step 6: Final answer
    x = 418.82

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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.