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Finding the Fourth Proportional to 139.96, 208.61 and 139.48

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Solution

The fourth proportional to 139.96, 208.61 and 139.48 is: 207.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.96 : 208.61 = 139.48 : x
  2. Step 2: Convert to fraction form
    139.96/208.61 = 139.48/x
  3. Step 3: Cross multiply
    139.96x = 208.61 × 139.48
  4. Step 4: Simplify right side
    139.96x = 29,096.92
  5. Step 5: Solve for x
    x = 29,096.92/139.96
  6. Step 6: Final answer
    x = 207.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.