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Finding the Fourth Proportional to 522.68, 721.26 and 289.80

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Solution

The fourth proportional to 522.68, 721.26 and 289.80 is: 399.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.68 : 721.26 = 289.80 : x
  2. Step 2: Convert to fraction form
    522.68/721.26 = 289.80/x
  3. Step 3: Cross multiply
    522.68x = 721.26 × 289.80
  4. Step 4: Simplify right side
    522.68x = 209,021.15
  5. Step 5: Solve for x
    x = 209,021.15/522.68
  6. Step 6: Final answer
    x = 399.91

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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.