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Finding the Fourth Proportional to 267.15, 400.15 and 138.63

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Solution

The fourth proportional to 267.15, 400.15 and 138.63 is: 207.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    267.15 : 400.15 = 138.63 : x
  2. Step 2: Convert to fraction form
    267.15/400.15 = 138.63/x
  3. Step 3: Cross multiply
    267.15x = 400.15 × 138.63
  4. Step 4: Simplify right side
    267.15x = 55,472.79
  5. Step 5: Solve for x
    x = 55,472.79/267.15
  6. Step 6: Final answer
    x = 207.65

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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.