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Finding the Fourth Proportional to 266.09, 398.69 and 103.68

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Solution

The fourth proportional to 266.09, 398.69 and 103.68 is: 155.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.09 : 398.69 = 103.68 : x
  2. Step 2: Convert to fraction form
    266.09/398.69 = 103.68/x
  3. Step 3: Cross multiply
    266.09x = 398.69 × 103.68
  4. Step 4: Simplify right side
    266.09x = 41,336.05
  5. Step 5: Solve for x
    x = 41,336.05/266.09
  6. Step 6: Final answer
    x = 155.35

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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.