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Finding the Fourth Proportional to 486.30, 671.10 and 279.34

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Solution

The fourth proportional to 486.30, 671.10 and 279.34 is: 385.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.30 : 671.10 = 279.34 : x
  2. Step 2: Convert to fraction form
    486.30/671.10 = 279.34/x
  3. Step 3: Cross multiply
    486.30x = 671.10 × 279.34
  4. Step 4: Simplify right side
    486.30x = 187,461.72
  5. Step 5: Solve for x
    x = 187,461.72/486.30
  6. Step 6: Final answer
    x = 385.49

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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.