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Finding the Fourth Proportional to 548.11, 821.99 and 317.10

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Solution

The fourth proportional to 548.11, 821.99 and 317.10 is: 475.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.11 : 821.99 = 317.10 : x
  2. Step 2: Convert to fraction form
    548.11/821.99 = 317.10/x
  3. Step 3: Cross multiply
    548.11x = 821.99 × 317.10
  4. Step 4: Simplify right side
    548.11x = 260,651.44
  5. Step 5: Solve for x
    x = 260,651.44/548.11
  6. Step 6: Final answer
    x = 475.55

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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.