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Finding the Fourth Proportional to 399.10, 554.55 and 394.82

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Solution

The fourth proportional to 399.10, 554.55 and 394.82 is: 548.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.10 : 554.55 = 394.82 : x
  2. Step 2: Convert to fraction form
    399.10/554.55 = 394.82/x
  3. Step 3: Cross multiply
    399.10x = 554.55 × 394.82
  4. Step 4: Simplify right side
    399.10x = 218,946.74
  5. Step 5: Solve for x
    x = 218,946.74/399.10
  6. Step 6: Final answer
    x = 548.60

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.