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Finding the Fourth Proportional to 522.62, 721.21 and 289.75

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Solution

The fourth proportional to 522.62, 721.21 and 289.75 is: 399.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.62 : 721.21 = 289.75 : x
  2. Step 2: Convert to fraction form
    522.62/721.21 = 289.75/x
  3. Step 3: Cross multiply
    522.62x = 721.21 × 289.75
  4. Step 4: Simplify right side
    522.62x = 208,966.99
  5. Step 5: Solve for x
    x = 208,966.99/522.62
  6. Step 6: Final answer
    x = 399.84

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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.