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Finding the Fourth Proportional to 268.16, 402.09 and 123.75

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Solution

The fourth proportional to 268.16, 402.09 and 123.75 is: 185.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.16 : 402.09 = 123.75 : x
  2. Step 2: Convert to fraction form
    268.16/402.09 = 123.75/x
  3. Step 3: Cross multiply
    268.16x = 402.09 × 123.75
  4. Step 4: Simplify right side
    268.16x = 49,758.64
  5. Step 5: Solve for x
    x = 49,758.64/268.16
  6. Step 6: Final answer
    x = 185.56

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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.