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Finding the Fourth Proportional to 268.66, 402.84 and 138.52

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Solution

The fourth proportional to 268.66, 402.84 and 138.52 is: 207.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.66 : 402.84 = 138.52 : x
  2. Step 2: Convert to fraction form
    268.66/402.84 = 138.52/x
  3. Step 3: Cross multiply
    268.66x = 402.84 × 138.52
  4. Step 4: Simplify right side
    268.66x = 55,801.40
  5. Step 5: Solve for x
    x = 55,801.40/268.66
  6. Step 6: Final answer
    x = 207.70

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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.