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Finding the Fourth Proportional to 571.43, 857.16 and 279.17

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Solution

The fourth proportional to 571.43, 857.16 and 279.17 is: 418.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.43 : 857.16 = 279.17 : x
  2. Step 2: Convert to fraction form
    571.43/857.16 = 279.17/x
  3. Step 3: Cross multiply
    571.43x = 857.16 × 279.17
  4. Step 4: Simplify right side
    571.43x = 239,293.91
  5. Step 5: Solve for x
    x = 239,293.91/571.43
  6. Step 6: Final answer
    x = 418.76

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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.