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Finding the Fourth Proportional to 267.20, 398.70 and 265.68

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Solution

The fourth proportional to 267.20, 398.70 and 265.68 is: 396.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    267.20 : 398.70 = 265.68 : x
  2. Step 2: Convert to fraction form
    267.20/398.70 = 265.68/x
  3. Step 3: Cross multiply
    267.20x = 398.70 × 265.68
  4. Step 4: Simplify right side
    267.20x = 105,926.62
  5. Step 5: Solve for x
    x = 105,926.62/267.20
  6. Step 6: Final answer
    x = 396.43

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.