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Finding the Fourth Proportional to 395.63, 548.30 and 389.55

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Solution

The fourth proportional to 395.63, 548.30 and 389.55 is: 539.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.63 : 548.30 = 389.55 : x
  2. Step 2: Convert to fraction form
    395.63/548.30 = 389.55/x
  3. Step 3: Cross multiply
    395.63x = 548.30 × 389.55
  4. Step 4: Simplify right side
    395.63x = 213,588.32
  5. Step 5: Solve for x
    x = 213,588.32/395.63
  6. Step 6: Final answer
    x = 539.88

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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.