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Finding the Fourth Proportional to 278.26, 386.57 and 275.73

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Solution

The fourth proportional to 278.26, 386.57 and 275.73 is: 383.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.26 : 386.57 = 275.73 : x
  2. Step 2: Convert to fraction form
    278.26/386.57 = 275.73/x
  3. Step 3: Cross multiply
    278.26x = 386.57 × 275.73
  4. Step 4: Simplify right side
    278.26x = 106,588.95
  5. Step 5: Solve for x
    x = 106,588.95/278.26
  6. Step 6: Final answer
    x = 383.06

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.