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Finding the Fourth Proportional to 275.77, 380.75 and 210.61

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Solution

The fourth proportional to 275.77, 380.75 and 210.61 is: 290.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.77 : 380.75 = 210.61 : x
  2. Step 2: Convert to fraction form
    275.77/380.75 = 210.61/x
  3. Step 3: Cross multiply
    275.77x = 380.75 × 210.61
  4. Step 4: Simplify right side
    275.77x = 80,189.76
  5. Step 5: Solve for x
    x = 80,189.76/275.77
  6. Step 6: Final answer
    x = 290.78

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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.