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Finding the Fourth Proportional to 522.29, 721.30 and 398.29

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Solution

The fourth proportional to 522.29, 721.30 and 398.29 is: 550.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.29 : 721.30 = 398.29 : x
  2. Step 2: Convert to fraction form
    522.29/721.30 = 398.29/x
  3. Step 3: Cross multiply
    522.29x = 721.30 × 398.29
  4. Step 4: Simplify right side
    522.29x = 287,286.58
  5. Step 5: Solve for x
    x = 287,286.58/522.29
  6. Step 6: Final answer
    x = 550.05

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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.