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Finding the Fourth Proportional to 268.30, 402.60 and 138.40

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Solution

The fourth proportional to 268.30, 402.60 and 138.40 is: 207.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.30 : 402.60 = 138.40 : x
  2. Step 2: Convert to fraction form
    268.30/402.60 = 138.40/x
  3. Step 3: Cross multiply
    268.30x = 402.60 × 138.40
  4. Step 4: Simplify right side
    268.30x = 55,719.84
  5. Step 5: Solve for x
    x = 55,719.84/268.30
  6. Step 6: Final answer
    x = 207.68

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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.