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Finding the Fourth Proportional to 268.78, 402.44 and 140.26

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Solution

The fourth proportional to 268.78, 402.44 and 140.26 is: 210.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.78 : 402.44 = 140.26 : x
  2. Step 2: Convert to fraction form
    268.78/402.44 = 140.26/x
  3. Step 3: Cross multiply
    268.78x = 402.44 × 140.26
  4. Step 4: Simplify right side
    268.78x = 56,446.23
  5. Step 5: Solve for x
    x = 56,446.23/268.78
  6. Step 6: Final answer
    x = 210.01

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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.