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Finding the Fourth Proportional to 207.77, 311.57 and 139.27

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Solution

The fourth proportional to 207.77, 311.57 and 139.27 is: 208.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.77 : 311.57 = 139.27 : x
  2. Step 2: Convert to fraction form
    207.77/311.57 = 139.27/x
  3. Step 3: Cross multiply
    207.77x = 311.57 × 139.27
  4. Step 4: Simplify right side
    207.77x = 43,392.35
  5. Step 5: Solve for x
    x = 43,392.35/207.77
  6. Step 6: Final answer
    x = 208.85

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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.