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Finding the Fourth Proportional to 268.70, 402.69 and 138.70

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Solution

The fourth proportional to 268.70, 402.69 and 138.70 is: 207.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.70 : 402.69 = 138.70 : x
  2. Step 2: Convert to fraction form
    268.70/402.69 = 138.70/x
  3. Step 3: Cross multiply
    268.70x = 402.69 × 138.70
  4. Step 4: Simplify right side
    268.70x = 55,853.10
  5. Step 5: Solve for x
    x = 55,853.10/268.70
  6. Step 6: Final answer
    x = 207.86

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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.