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Finding the Fourth Proportional to 267.90, 401.30 and 139.38

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Solution

The fourth proportional to 267.90, 401.30 and 139.38 is: 208.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    267.90 : 401.30 = 139.38 : x
  2. Step 2: Convert to fraction form
    267.90/401.30 = 139.38/x
  3. Step 3: Cross multiply
    267.90x = 401.30 × 139.38
  4. Step 4: Simplify right side
    267.90x = 55,933.19
  5. Step 5: Solve for x
    x = 55,933.19/267.90
  6. Step 6: Final answer
    x = 208.78

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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.