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Finding the Fourth Proportional to 397.56, 548.47 and 279.71

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Solution

The fourth proportional to 397.56, 548.47 and 279.71 is: 385.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.56 : 548.47 = 279.71 : x
  2. Step 2: Convert to fraction form
    397.56/548.47 = 279.71/x
  3. Step 3: Cross multiply
    397.56x = 548.47 × 279.71
  4. Step 4: Simplify right side
    397.56x = 153,409.10
  5. Step 5: Solve for x
    x = 153,409.10/397.56
  6. Step 6: Final answer
    x = 385.88

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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.