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Finding the Fourth Proportional to 268.96, 403.49 and 86.48

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Solution

The fourth proportional to 268.96, 403.49 and 86.48 is: 129.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.96 : 403.49 = 86.48 : x
  2. Step 2: Convert to fraction form
    268.96/403.49 = 86.48/x
  3. Step 3: Cross multiply
    268.96x = 403.49 × 86.48
  4. Step 4: Simplify right side
    268.96x = 34,892.81
  5. Step 5: Solve for x
    x = 34,892.81/268.96
  6. Step 6: Final answer
    x = 129.73

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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.