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Finding the Fourth Proportional to 278.06, 415.09 and 268.45

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Solution

The fourth proportional to 278.06, 415.09 and 268.45 is: 400.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.06 : 415.09 = 268.45 : x
  2. Step 2: Convert to fraction form
    278.06/415.09 = 268.45/x
  3. Step 3: Cross multiply
    278.06x = 415.09 × 268.45
  4. Step 4: Simplify right side
    278.06x = 111,429.20
  5. Step 5: Solve for x
    x = 111,429.20/278.06
  6. Step 6: Final answer
    x = 400.75

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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.