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Finding the Fourth Proportional to 268.80, 403.17 and 138.72

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Solution

The fourth proportional to 268.80, 403.17 and 138.72 is: 208.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.80 : 403.17 = 138.72 : x
  2. Step 2: Convert to fraction form
    268.80/403.17 = 138.72/x
  3. Step 3: Cross multiply
    268.80x = 403.17 × 138.72
  4. Step 4: Simplify right side
    268.80x = 55,927.74
  5. Step 5: Solve for x
    x = 55,927.74/268.80
  6. Step 6: Final answer
    x = 208.06

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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.