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Finding the Fourth Proportional to 278.03, 415.43 and 268.31

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Solution

The fourth proportional to 278.03, 415.43 and 268.31 is: 400.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.03 : 415.43 = 268.31 : x
  2. Step 2: Convert to fraction form
    278.03/415.43 = 268.31/x
  3. Step 3: Cross multiply
    278.03x = 415.43 × 268.31
  4. Step 4: Simplify right side
    278.03x = 111,464.73
  5. Step 5: Solve for x
    x = 111,464.73/278.03
  6. Step 6: Final answer
    x = 400.91

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.