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Finding the Fourth Proportional to 278.58, 386.03 and 275.22

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Solution

The fourth proportional to 278.58, 386.03 and 275.22 is: 381.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.58 : 386.03 = 275.22 : x
  2. Step 2: Convert to fraction form
    278.58/386.03 = 275.22/x
  3. Step 3: Cross multiply
    278.58x = 386.03 × 275.22
  4. Step 4: Simplify right side
    278.58x = 106,243.18
  5. Step 5: Solve for x
    x = 106,243.18/278.58
  6. Step 6: Final answer
    x = 381.37

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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.