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Finding the Fourth Proportional to 267.21, 398.48 and 264.78

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Solution

The fourth proportional to 267.21, 398.48 and 264.78 is: 394.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    267.21 : 398.48 = 264.78 : x
  2. Step 2: Convert to fraction form
    267.21/398.48 = 264.78/x
  3. Step 3: Cross multiply
    267.21x = 398.48 × 264.78
  4. Step 4: Simplify right side
    267.21x = 105,509.53
  5. Step 5: Solve for x
    x = 105,509.53/267.21
  6. Step 6: Final answer
    x = 394.86

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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.