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Finding the Fourth Proportional to 522.72, 721.37 and 286.67

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Solution

The fourth proportional to 522.72, 721.37 and 286.67 is: 395.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.72 : 721.37 = 286.67 : x
  2. Step 2: Convert to fraction form
    522.72/721.37 = 286.67/x
  3. Step 3: Cross multiply
    522.72x = 721.37 × 286.67
  4. Step 4: Simplify right side
    522.72x = 206,797.66
  5. Step 5: Solve for x
    x = 206,797.66/522.72
  6. Step 6: Final answer
    x = 395.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.