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Finding the Fourth Proportional to 266.40, 399.30 and 103.97

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Solution

The fourth proportional to 266.40, 399.30 and 103.97 is: 155.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.40 : 399.30 = 103.97 : x
  2. Step 2: Convert to fraction form
    266.40/399.30 = 103.97/x
  3. Step 3: Cross multiply
    266.40x = 399.30 × 103.97
  4. Step 4: Simplify right side
    266.40x = 41,513.22
  5. Step 5: Solve for x
    x = 41,513.22/266.40
  6. Step 6: Final answer
    x = 155.83

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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.