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Finding the Fourth Proportional to 268.80, 403.25 and 86.18

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Solution

The fourth proportional to 268.80, 403.25 and 86.18 is: 129.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.80 : 403.25 = 86.18 : x
  2. Step 2: Convert to fraction form
    268.80/403.25 = 86.18/x
  3. Step 3: Cross multiply
    268.80x = 403.25 × 86.18
  4. Step 4: Simplify right side
    268.80x = 34,749.64
  5. Step 5: Solve for x
    x = 34,749.64/268.80
  6. Step 6: Final answer
    x = 129.28

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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.