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Finding the Fourth Proportional to 268.72, 402.78 and 122.59

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Solution

The fourth proportional to 268.72, 402.78 and 122.59 is: 183.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.72 : 402.78 = 122.59 : x
  2. Step 2: Convert to fraction form
    268.72/402.78 = 122.59/x
  3. Step 3: Cross multiply
    268.72x = 402.78 × 122.59
  4. Step 4: Simplify right side
    268.72x = 49,376.80
  5. Step 5: Solve for x
    x = 49,376.80/268.72
  6. Step 6: Final answer
    x = 183.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.