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Finding the Fourth Proportional to 268.32, 402.39 and 85.68

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Solution

The fourth proportional to 268.32, 402.39 and 85.68 is: 128.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.32 : 402.39 = 85.68 : x
  2. Step 2: Convert to fraction form
    268.32/402.39 = 85.68/x
  3. Step 3: Cross multiply
    268.32x = 402.39 × 85.68
  4. Step 4: Simplify right side
    268.32x = 34,476.78
  5. Step 5: Solve for x
    x = 34,476.78/268.32
  6. Step 6: Final answer
    x = 128.49

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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.