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Finding the Fourth Proportional to 275.67, 380.79 and 210.51

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Solution

The fourth proportional to 275.67, 380.79 and 210.51 is: 290.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.67 : 380.79 = 210.51 : x
  2. Step 2: Convert to fraction form
    275.67/380.79 = 210.51/x
  3. Step 3: Cross multiply
    275.67x = 380.79 × 210.51
  4. Step 4: Simplify right side
    275.67x = 80,160.10
  5. Step 5: Solve for x
    x = 80,160.10/275.67
  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.