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Finding the Fourth Proportional to 207.93, 311.28 and 139.29

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Solution

The fourth proportional to 207.93, 311.28 and 139.29 is: 208.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.93 : 311.28 = 139.29 : x
  2. Step 2: Convert to fraction form
    207.93/311.28 = 139.29/x
  3. Step 3: Cross multiply
    207.93x = 311.28 × 139.29
  4. Step 4: Simplify right side
    207.93x = 43,358.19
  5. Step 5: Solve for x
    x = 43,358.19/207.93
  6. Step 6: Final answer
    x = 208.52

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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.