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Finding the Fourth Proportional to 268.45, 399.26 and 263.28

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Solution

The fourth proportional to 268.45, 399.26 and 263.28 is: 391.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.45 : 399.26 = 263.28 : x
  2. Step 2: Convert to fraction form
    268.45/399.26 = 263.28/x
  3. Step 3: Cross multiply
    268.45x = 399.26 × 263.28
  4. Step 4: Simplify right side
    268.45x = 105,119.33
  5. Step 5: Solve for x
    x = 105,119.33/268.45
  6. Step 6: Final answer
    x = 391.58

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.