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Finding the Fourth Proportional to 268.95, 403.47 and 86.28

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Solution

The fourth proportional to 268.95, 403.47 and 86.28 is: 129.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.95 : 403.47 = 86.28 : x
  2. Step 2: Convert to fraction form
    268.95/403.47 = 86.28/x
  3. Step 3: Cross multiply
    268.95x = 403.47 × 86.28
  4. Step 4: Simplify right side
    268.95x = 34,811.39
  5. Step 5: Solve for x
    x = 34,811.39/268.95
  6. Step 6: Final answer
    x = 129.43

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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.