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Finding the Fourth Proportional to 548.29, 821.13 and 418.13

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Solution

The fourth proportional to 548.29, 821.13 and 418.13 is: 626.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.29 : 821.13 = 418.13 : x
  2. Step 2: Convert to fraction form
    548.29/821.13 = 418.13/x
  3. Step 3: Cross multiply
    548.29x = 821.13 × 418.13
  4. Step 4: Simplify right side
    548.29x = 343,339.09
  5. Step 5: Solve for x
    x = 343,339.09/548.29
  6. Step 6: Final answer
    x = 626.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.