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Finding the Fourth Proportional to 207.84, 311.20 and 139.36

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Solution

The fourth proportional to 207.84, 311.20 and 139.36 is: 208.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.84 : 311.20 = 139.36 : x
  2. Step 2: Convert to fraction form
    207.84/311.20 = 139.36/x
  3. Step 3: Cross multiply
    207.84x = 311.20 × 139.36
  4. Step 4: Simplify right side
    207.84x = 43,368.83
  5. Step 5: Solve for x
    x = 43,368.83/207.84
  6. Step 6: Final answer
    x = 208.66

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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.