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Finding the Fourth Proportional to 522.57, 721.17 and 289.70

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Solution

The fourth proportional to 522.57, 721.17 and 289.70 is: 399.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.57 : 721.17 = 289.70 : x
  2. Step 2: Convert to fraction form
    522.57/721.17 = 289.70/x
  3. Step 3: Cross multiply
    522.57x = 721.17 × 289.70
  4. Step 4: Simplify right side
    522.57x = 208,919.34
  5. Step 5: Solve for x
    x = 208,919.34/522.57
  6. Step 6: Final answer
    x = 399.79

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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.