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Finding the Fourth Proportional to 278.40, 415.40 and 269.04

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Solution

The fourth proportional to 278.40, 415.40 and 269.04 is: 401.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.40 : 415.40 = 269.04 : x
  2. Step 2: Convert to fraction form
    278.40/415.40 = 269.04/x
  3. Step 3: Cross multiply
    278.40x = 415.40 × 269.04
  4. Step 4: Simplify right side
    278.40x = 111,759.22
  5. Step 5: Solve for x
    x = 111,759.22/278.40
  6. Step 6: Final answer
    x = 401.43

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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.