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Finding the Fourth Proportional to 397.84, 548.34 and 279.85

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Solution

The fourth proportional to 397.84, 548.34 and 279.85 is: 385.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.84 : 548.34 = 279.85 : x
  2. Step 2: Convert to fraction form
    397.84/548.34 = 279.85/x
  3. Step 3: Cross multiply
    397.84x = 548.34 × 279.85
  4. Step 4: Simplify right side
    397.84x = 153,452.95
  5. Step 5: Solve for x
    x = 153,452.95/397.84
  6. Step 6: Final answer
    x = 385.72

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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.