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Finding the Fourth Proportional to 522.91, 721.56 and 398.26

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Solution

The fourth proportional to 522.91, 721.56 and 398.26 is: 549.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.91 : 721.56 = 398.26 : x
  2. Step 2: Convert to fraction form
    522.91/721.56 = 398.26/x
  3. Step 3: Cross multiply
    522.91x = 721.56 × 398.26
  4. Step 4: Simplify right side
    522.91x = 287,368.49
  5. Step 5: Solve for x
    x = 287,368.49/522.91
  6. Step 6: Final answer
    x = 549.56

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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.