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Finding the Fourth Proportional to 397.30, 548.40 and 231.60

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Solution

The fourth proportional to 397.30, 548.40 and 231.60 is: 319.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.30 : 548.40 = 231.60 : x
  2. Step 2: Convert to fraction form
    397.30/548.40 = 231.60/x
  3. Step 3: Cross multiply
    397.30x = 548.40 × 231.60
  4. Step 4: Simplify right side
    397.30x = 127,009.44
  5. Step 5: Solve for x
    x = 127,009.44/397.30
  6. Step 6: Final answer
    x = 319.68

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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.