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Finding the Fourth Proportional to 207.63, 311.15 and 138.07

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Solution

The fourth proportional to 207.63, 311.15 and 138.07 is: 206.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.63 : 311.15 = 138.07 : x
  2. Step 2: Convert to fraction form
    207.63/311.15 = 138.07/x
  3. Step 3: Cross multiply
    207.63x = 311.15 × 138.07
  4. Step 4: Simplify right side
    207.63x = 42,961.21
  5. Step 5: Solve for x
    x = 42,961.21/207.63
  6. Step 6: Final answer
    x = 206.91

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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.