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Finding the Fourth Proportional to 266.39, 399.28 and 189.54

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Solution

The fourth proportional to 266.39, 399.28 and 189.54 is: 284.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.39 : 399.28 = 189.54 : x
  2. Step 2: Convert to fraction form
    266.39/399.28 = 189.54/x
  3. Step 3: Cross multiply
    266.39x = 399.28 × 189.54
  4. Step 4: Simplify right side
    266.39x = 75,679.41
  5. Step 5: Solve for x
    x = 75,679.41/266.39
  6. Step 6: Final answer
    x = 284.09

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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.