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Finding the Fourth Proportional to 397.40, 548.43 and 231.65

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Solution

The fourth proportional to 397.40, 548.43 and 231.65 is: 319.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.40 : 548.43 = 231.65 : x
  2. Step 2: Convert to fraction form
    397.40/548.43 = 231.65/x
  3. Step 3: Cross multiply
    397.40x = 548.43 × 231.65
  4. Step 4: Simplify right side
    397.40x = 127,043.81
  5. Step 5: Solve for x
    x = 127,043.81/397.40
  6. Step 6: Final answer
    x = 319.69

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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.