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Finding the Fourth Proportional to 275.88, 380.86 and 213.58

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Solution

The fourth proportional to 275.88, 380.86 and 213.58 is: 294.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.88 : 380.86 = 213.58 : x
  2. Step 2: Convert to fraction form
    275.88/380.86 = 213.58/x
  3. Step 3: Cross multiply
    275.88x = 380.86 × 213.58
  4. Step 4: Simplify right side
    275.88x = 81,344.08
  5. Step 5: Solve for x
    x = 81,344.08/275.88
  6. Step 6: Final answer
    x = 294.85

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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.